fixup some docs

Author: timvink

docs/index.md

@@ -12,7 +12,7 @@ pip3 install mkdocs-git-authors-plugin
 
 Next, add the following lines to your `mkdocs.yml`:
 
-```yml
+```yaml
 plugins:
   - search
   - git-authors

docs/options.md

@@ -2,7 +2,7 @@
 
 You can customize the plugin by setting options in your `mkdocs.yml` file. Here is an example of all the options this plugin offers:
 
-```yml
+```yaml
 plugins:
     - git-authors:
         show_contribution: true

docs/overrides/main.html

@@ -6,7 +6,7 @@
   {% if git_page_authors %}
     <div class="md-source-date">
       <small>
-          Authors: {{ git_page_authors }}
+          Authors: {{ git_page_authors | default('enable mkdocs-git-authors-plugin') }}
       </small>
     </div>
   {% endif %}

docs/usage.md

@@ -41,7 +41,7 @@ If you use the [mkdocs-material](https://github.com/squidfunk/mkdocs-material) t
   {% if git_page_authors %}
     <div class="md-source-date">
       <small>
-          Authors: {{ git_page_authors }}
+          Authors: {{ git_page_authors | default('enable mkdocs-git-authors-plugin') }}
       </small>
     </div>
   {% endif %}
@@ -50,7 +50,7 @@ If you use the [mkdocs-material](https://github.com/squidfunk/mkdocs-material) t
 
 2) In `mkdocs.yml` make sure to specify the custom directory with the theme overrides:
 
-```yml
+```yaml
 theme:
     name: material
     custom_dir: docs/overrides
@@ -77,13 +77,13 @@ https://github.com/mkdocs/mkdocs/blob/master/mkdocs/themes/mkdocs/content.html -
 {{ page.content }}
 
 {% if git_page_authors %}
-  <p><small>Authors: {{ git_page_authors }}</small></p>
+  <p><small>Authors: {{ git_page_authors | default('enable mkdocs-git-authors-plugin') }}</small></p>
 {% endif %}
 ```
 
 2) In `mkdocs.yml` make sure to specify the custom directory with the theme overrides:
 
-```yml
+```yaml
 theme:
     name: mkdocs
     custom_dir: docs/overrides

mkdocs.yml

@@ -23,4 +23,6 @@ nav:
   - Contributing: contributing.md
 
 markdown_extensions:
-  - markdown.extensions.codehilite
+  - markdown.extensions.codehilite
+  - pymdownx.escapeall
+  - pymdownx.superfences