Move remarks about context-manager to the Usage page (#383)

Fix #382

docs/remarks.rst

@@ -100,23 +100,3 @@ to improve the flow of the test:
             # ...
 
 But this is arguably a little more complex than using ``pytest-mock``.
-
-Usage as context manager
-------------------------
-
-Although mocker's API is intentionally the same as ``mock.patch``'s, its use
-as context manager and function decorator is **not** supported through the
-fixture:
-
-.. code-block:: python
-
-    def test_context_manager(mocker):
-        a = A()
-        with mocker.patch.object(a, 'doIt', return_value=True, autospec=True):  # DO NOT DO THIS
-            assert a.doIt() == True
-
-The purpose of this plugin is to make the use of context managers and
-function decorators for mocking unnecessary, so it will emit a warning when used as such.
-
-If you really intend to mock a context manager, ``mocker.patch.context_manager`` exists
-which won't issue the above warning.

docs/usage.rst

@@ -136,3 +136,24 @@ It may receive an optional name that is shown in its ``repr``, useful for debugg
 .. seealso::
 
     ``async_stub`` method, which actually the same as ``stub`` but makes async stub.
+
+
+Usage as context manager
+------------------------
+
+Although mocker's API is intentionally the same as ``mock.patch``'s, its use
+as context manager and function decorator is **not** supported through the
+fixture:
+
+.. code-block:: python
+
+    def test_context_manager(mocker):
+        a = A()
+        with mocker.patch.object(a, 'doIt', return_value=True, autospec=True):  # DO NOT DO THIS
+            assert a.doIt() == True
+
+The purpose of this plugin is to make the use of context managers and
+function decorators for mocking unnecessary, so it will emit a warning when used as such.
+
+If you really intend to mock a context manager, ``mocker.patch.context_manager`` exists
+which won't issue the above warning.