Remove "prior to Homestead"

docs/contracts.rst

@@ -885,7 +885,6 @@ Libraries
 
 Libraries are similar to contracts, but their purpose is that they are deployed
 only once at a specific address and their code is reused using the ``DELEGATECALL``
-(``CALLCODE`` until Homestead)
 feature of the EVM. This means that if library functions are called, their code
 is executed in the context of the calling contract, i.e. ``this`` points to the
 calling contract, and especially the storage from the calling contract can be
@@ -976,8 +975,7 @@ are all compiled as calls (``DELEGATECALL``) to an external
 contract/library. If you use libraries, take care that an
 actual external function call is performed.
 ``msg.sender``, ``msg.value`` and ``this`` will retain their values
-in this call, though (prior to Homestead, ``msg.sender`` and
-``msg.value`` changed, though).
+in this call, though.
 
 The following example shows how to use memory types and
 internal functions in libraries in order to implement
@@ -1079,7 +1077,7 @@ In both situations, all functions, even those where the
 type of the first parameter does not match the type of
 the object, are attached. The type is checked at the
 point the function is called and function overload
-resolution is performed.
+resolution is performed at the compilation time.
 
 The ``using A for B;`` directive is active for the current
 scope, which is limited to a contract for now but will