Remove wrong note about srclibs

Absolute path is used to replace the placeholder.

_docs/Build_Metadata_Reference.md

@@ -416,7 +416,7 @@ git-svn _Repo_ URL:
 http:https://svn.code.sf.net/p/project/code/svn;trunk=trunk;tags=tags;branches=branches
 
 If the _RepoType_ is `srclib`, then you must specify the name of the
-according srclib .txt file. For example if `scrlibs/FooBar.txt` exist
+according srclib .yml file. For example if `srclibs/FooBar.yml` exist
 and you want to use this srclib, then you have to set _Repo_ to `FooBar`.
 
 
@@ -622,9 +622,8 @@ configuration to the build. These are (roughly in order of application):
  projects in the working directory and one level down; Prepare: can
  be used for any kind of preparation: in particular if you need to
  update the project with a particular target. You can then also use
- \$\$name\$\$ in the init/prebuild/build command to substitute the
- relative path to the library directory, but it could need tweaking
- if you've changed into another directory.
+ `$$name$$` in the init/prebuild/build command to substitute the
+ absolute path to the library directory.
 
  Currently srclibs are used when upstream uses jar files or
  pulls dependencies from non-trusted repositories. Because srclibs