Remove an unpaired " and a needless \n

The \n" makes the color of document web page red. It will be better for reading after removing it.

doc/manual/getting-started.rst

@@ -112,7 +112,7 @@ those available for the ``perl`` and ``ruby`` programs::
 
  -J, --sysimage <file> Start up with the given system image file
  --precompiled={yes|no} Use precompiled code from system image if available
- --compilecache={yes|no} Enable/disable incremental precompilation of modules\n"
+ --compilecache={yes|no} Enable/disable incremental precompilation of modules
  -H, --home <dir> Set location of julia executable
  --startup-file={yes|no} Load ~/.juliarc.jl
  -f, --no-startup Don't load ~/.juliarc (deprecated, use --startup-file=no)