Correct code-block usage.
Correct usage of 'CLI Example' in documentation blocks

This mass-edit was done using the following shell command:
ack --python -l '^(\s*)CLI Example::$' \
| xargs sed -i \
's/^\(\s*\)CLI Example::/\1CLI Example:\n\n\1.. code-block:: bash/g'
Correct usage of 'Example' in documentation blocks

This mass-edit was done using the following shell command:
ack --python -l '^(\s*)Example::$' | xargs sed -i \
's/^\(\s*\)Example::/\1Example:\n\n\1.. code-block:: yaml/g'
Merge pull request #12775 from eliasp/doc-example-consistency

Consistency fixes for examples in documentation blocks