Avoid clashing inline markup

Stops and starts emphasis around an inline code markup.

Also removes two emphasis sections, since these are at the start of
bullet points, creating emphasis already.

docs/source/config_files.rst

@@ -152,7 +152,7 @@ To use python-2.7: add ``python-2.7`` in runtime.txt file.
 The repository will run in a virtualenv with
 Python 2 installed. To see a full example repository, visit our
 `Python2 example <https://github.com/binder-examples/python2_runtime/blob/master/runtime.txt>`_.
-**Python versions in ``runtime.txt`` are ignored when** ``environment.yml`` **is
+**Python versions in** ``runtime.txt`` **are ignored when** ``environment.yml`` **is
 present in the same folder**.
 
 repo2docker uses R libraries pinned to a specific snapshot on

docs/source/howto/languages.rst

@@ -23,7 +23,7 @@ Specifying a version of Python
 
 To specify a specific version of Python, you have two options:
 
-* **use ``runtime.txt``**. Include a line that specifies the Python version in
+* Use ``runtime.txt``. Include a line that specifies the Python version in
   this file. This line takes the following form::
 
     python=X.X
@@ -31,7 +31,7 @@ To specify a specific version of Python, you have two options:
   For example,::
 
     python=2.7
-* **Use ``environment.yml``**. The Anaconda distribution also lets you define
+* Use ``environment.yml``. The Anaconda distribution also lets you define
   the Python environment within ``environment.yml``. To do so, add ``python=X.X``
   to your dependencies section, like so::