Rename /docs -> /doc

README.md

@@ -107,4 +107,4 @@ linear in the size of the input (although the constant factor is not small).
 
 # Implementation/High-level Documentation
 
-[See the documentation index](docs/implementation/index.md)
+[See the documentation index](doc/implementation/index.md)

brittany.cabal

@@ -4,9 +4,9 @@ synopsis:             Haskell source code formatter
 description: {
   See <https://github.com/lspitzner/brittany/blob/master/README.md the README>
 
-  If you are interested in the implementation, have a look at <https://github.com/lspitzner/brittany/blob/master/docs/implementation/theory.md this document>;
+  If you are interested in the implementation, have a look at <https://github.com/lspitzner/brittany/blob/master/doc/implementation/theory.md this document>;
 
-  The implementation is documented in more detail <https://github.com/lspitzner/brittany/blob/master/docs/implementation/index.md here>.
+  The implementation is documented in more detail <https://github.com/lspitzner/brittany/blob/master/doc/implementation/index.md here>.
 }
 license:              AllRightsReserved
 -- license-file:         LICENSE