documentation improvements for Yard/Ydoc newbies, also relative links replace absolute links where possible so that the user is left with the exact version and not forced to current web docs, in accordance with DOCS-197

Author: gjmurakami-10gen

source/GridFS.md

@@ -88,7 +88,7 @@ Deleting a file is as simple as providing the id:
 
 ### The GridFileSystem class
 
-[GridFileSystem](http://api.mongodb.org/ruby/current/Mongo/GridFileSystem.html) is a light emulation of a file system and therefore has a couple of unique properties. The first is that filenames are assumed to be unique. The second, a consequence of the first, is that files are versioned. To see what this means, let's create a GridFileSystem instance:
+[GridFileSystem](Mongo/GridFileSystem.html) is a light emulation of a file system and therefore has a couple of unique properties. The first is that filenames are assumed to be unique. The second, a consequence of the first, is that files are versioned. To see what this means, let's create a GridFileSystem instance:
 
 #### Saving files
 
@@ -154,5 +154,5 @@ All of the options for storing metadata and saving in safe mode are available fo
 
 ### Advanced Users
 
-Astute code readers will notice that the Grid and GridFileSystem classes are merely thin wrappers around an underlying [GridIO class](http://api.mongodb.org/ruby/current/Mongo/GridIO.html). This means that it's easy to customize the GridFS implementation presented here; just use GridIO for all the low-level work, and build the API you need in an external manager class similar to Grid or GridFileSystem.
+Astute code readers will notice that the Grid and GridFileSystem classes are merely thin wrappers around an underlying [GridIO class](Mongo/GridIO.html). This means that it's easy to customize the GridFS implementation presented here; just use GridIO for all the low-level work, and build the API you need in an external manager class similar to Grid or GridFileSystem.