Minor typo in the contributing info

Author: Julian

CONTRIBUTING.rst

@@ -14,4 +14,5 @@ You can also browse it from this repository from
 ``doc/internals/contributing.rst``
 
 Sphinx uses GitHub to host source code, track patches and bugs, and more.
-Please make an effort to provide as much possible when filing bugs.
+Please make an effort to provide as much detail as possible when filing
+bugs.