Remove atdoc_str from Libc docs and reformat.

Also remove rst block by adding special rst link printing.

base/docs/helpdb/Libc.jl

@@ -2,102 +2,119 @@
 
 # Libc
 
-doc"""
+"""
  TmStruct([seconds])
 
-Convert a number of seconds since the epoch to broken-down format, with fields `sec`, `min`, `hour`, `mday`, `month`, `year`, `wday`, `yday`, and `isdst`.
+Convert a number of seconds since the epoch to broken-down format, with fields `sec`, `min`,
+`hour`, `mday`, `month`, `year`, `wday`, `yday`, and `isdst`.
 """
 Libc.TmStruct
 
-doc"""
+"""
  dlext
 
 File extension for dynamic libraries (e.g. dll, dylib, so) on the current platform.
 """
 Libdl.dlext
 
-doc"""
+"""
  time(t::TmStruct)
 
 Converts a `TmStruct` struct to a number of seconds since the epoch.
 """
 Libc.time
 
-doc"""
+"""
  calloc(num::Integer, size::Integer) -> Ptr{Void}
 
 Call `calloc` from the C standard library.
 """
 Libc.calloc
 
-doc"""
+"""
  strerror(n=errno())
 
 Convert a system call error code to a descriptive string
 """
 Libc.strerror
 
-doc"""
+"""
  realloc(addr::Ptr, size::Integer) -> Ptr{Void}
 
 Call `realloc` from the C standard library.
 
-See warning in the documentation for `free` regarding only using this on memory originally obtained from `malloc`.
+See warning in the documentation for `free` regarding only using this on memory originally
+obtained from `malloc`.
 """
 Libc.realloc
 
-doc"""
+"""
  free(addr::Ptr)
 
-Call `free` from the C standard library. Only use this on memory obtained from `malloc`, not on pointers retrieved from other C libraries. `Ptr` objects obtained from C libraries should be freed by the free functions defined in that library, to avoid assertion failures if multiple `libc` libraries exist on the system.
+Call `free` from the C standard library. Only use this on memory obtained from `malloc`, not
+on pointers retrieved from other C libraries. `Ptr` objects obtained from C libraries should
+be freed by the free functions defined in that library, to avoid assertion failures if
+multiple `libc` libraries exist on the system.
 """
 Libc.free
 
-doc"""
+"""
  strftime([format], time)
 
-Convert time, given as a number of seconds since the epoch or a `TmStruct`, to a formatted string using the given format. Supported formats are the same as those in the standard C library.
+Convert time, given as a number of seconds since the epoch or a `TmStruct`, to a formatted
+string using the given format. Supported formats are the same as those in the standard C
+library.
 """
 Libc.strftime
 
-doc"""
+"""
  errno([code])
 
-Get the value of the C library's `errno`. If an argument is specified, it is used to set the value of `errno`.
+Get the value of the C library's `errno`. If an argument is specified, it is used to set the
+value of `errno`.
 
-The value of `errno` is only valid immediately after a `ccall` to a C library routine that sets it. Specifically, you cannot call `errno` at the next prompt in a REPL, because lots of code is executed between prompts.
+The value of `errno` is only valid immediately after a `ccall` to a C library routine that
+sets it. Specifically, you cannot call `errno` at the next prompt in a REPL, because lots of
+code is executed between prompts.
 """
 Libc.errno
 
-doc"""
+"""
  malloc(size::Integer) -> Ptr{Void}
 
 Call `malloc` from the C standard library.
 """
 Libc.malloc
 
-doc"""
+"""
  strptime([format], timestr)
 
-Parse a formatted time string into a `TmStruct` giving the seconds, minute, hour, date, etc. Supported formats are the same as those in the standard C library. On some platforms, timezones will not be parsed correctly. If the result of this function will be passed to `time` to convert it to seconds since the epoch, the `isdst` field should be filled in manually. Setting it to `-1` will tell the C library to use the current system settings to determine the timezone.
+Parse a formatted time string into a `TmStruct` giving the seconds, minute, hour, date, etc.
+Supported formats are the same as those in the standard C library. On some platforms,
+timezones will not be parsed correctly. If the result of this function will be passed to
+`time` to convert it to seconds since the epoch, the `isdst` field should be filled in
+manually. Setting it to `-1` will tell the C library to use the current system settings to
+determine the timezone.
 """
 Libc.strptime
 
-doc"""
+"""
  flush_cstdio()
 
 Flushes the C `stdout` and `stderr` streams (which may have been written to by external C code).
 """
 Libc.flush_cstdio
 
-doc"""
-```rst
-.. msync(ptr, len, [flags])
+"""
+ msync(ptr, len, [flags])
 
-Forces synchronization of the :func:`mmap`\ ped memory region from ``ptr`` to ``ptr+len``. Flags defaults to ``MS_SYNC``, but can be a combination of ``MS_ASYNC``, ``MS_SYNC``, or ``MS_INVALIDATE``. See your platform man page for specifics. The flags argument is not valid on Windows.
+Forces synchronization of the [`mmap`](:func:`mmap`)ped memory region from `ptr` to
+`ptr+len`. Flags defaults to `MS_SYNC`, but can be a combination of `MS_ASYNC`, `MS_SYNC`,
+or `MS_INVALIDATE`. See your platform man page for specifics. The flags argument is not
+valid on Windows.
 
-You may not need to call ``msync``, because synchronization is performed at intervals automatically by the operating system. However, you can call this directly if, for example, you are concerned about losing the result of a long-running calculation.
-```
+You may not need to call `msync`, because synchronization is performed at intervals
+automatically by the operating system. However, you can call this directly if, for example,
+you are concerned about losing the result of a long-running calculation.
 """
 Libc.msync
-