Simplify how the config file is referred to.

Author: StefanoChiodino

docs/conda.rst

@@ -15,7 +15,7 @@ Activating Conda
 ----------------
 
 Conda Support is the first feature enabled with :doc:`yaml-config`.
-You can enable it by creating a `readthedocs.yml`, `readthedocs.yaml`, or `.readthedocs.yml` file in the root of your
+You can enable it by creating a `readthedocs.yml` file in the root of your
 repository with the contents:
 
 .. code-block:: yaml

docs/design/yaml-file.rst

@@ -89,6 +89,7 @@ The file must be on the root directory of the repository, and must be named as:
 - ``readthedocs.yml``
 - ``readthedocs.yaml``
 - ``.readthedocs.yml``
+- ``.readthedocs.yaml``
 
 Conventions
 ~~~~~~~~~~~

docs/yaml-config.rst

@@ -2,7 +2,7 @@ Read the Docs YAML Config
 =========================
 
 Read the Docs now has support for configuring builds with a YAML file.
-The file, ``readthedocs.yml``, ``.readthedocs.yml``, or ``readthedocs.yaml``, must be in the root directory of your project.
+The file, ``readthedocs.yml``, must be in the root directory of your project.
 
 .. warning:: This feature is in a beta state.
              Please file an `issue`_ if you find anything wrong.