Remove stray colons in config.rst left over from #3111 (#3120)

Author: posita

docs/changelog/3118.bugfix.rst

@@ -0,0 +1 @@
+Fix bug in ``config.rst`` by removing stray colons left over from (:issue:`3111`) - by :user:`posita`.

docs/config.rst

@@ -1023,19 +1023,19 @@ For example, given this config:
       foo=bar
     commands = pytest tests
 
-You could enable ``ignore_errors`` by running::
+You could enable ``ignore_errors`` by running:
 
 .. code-block:: bash
 
    tox --override testenv.ignore_errors=True
 
-You could add additional dependencies by running::
+You could add additional dependencies by running:
 
 .. code-block:: bash
 
    tox --override testenv.deps+=pytest-xdist,pytest-cov
 
-You could set additional environment variables by running::
+You could set additional environment variables by running:
 
 .. code-block:: bash
 

docs/installation.rst

@@ -55,7 +55,7 @@ Installing an unreleased version is discouraged and should be only done for test
 a pip version of at least ``18.0.0`` and use the following command:
 
 
-.. code-block:: console
+.. code-block:: bash
 
     pip install git+https://github.com/tox-dev/tox.git@rewrite