Merge pull request #9384 from insaneirish/devel

Change "usuable" to "usable".

hacking/templates/rst.j2

@@ -130,7 +130,7 @@ Should you have a question rather than a bug report, inquries are welcome on the
 
 Documentation updates for this module can also be edited directly by submitting a pull request to the module source code, just look for the "DOCUMENTATION" block in the source tree.
 
-Note that this module is designated a "extras" module.  Non-core modules are still fully usuable, but may receive slightly lower response rates for issues and pull requests.
+Note that this module is designated a "extras" module.  Non-core modules are still fully usable, but may receive slightly lower response rates for issues and pull requests.
 Popular "extras" modules may be promoted to core modules over time.
 
 {% endif %}