Docs - fix up whitespace issues

docs/advanced_topics/third_party_tutorials.md

@@ -178,4 +178,4 @@ You can also find more resources from the community on [Awesome Wagtail](https:/
 ## Tip
 
 We are working on a collection of Wagtail tutorials and best practices.
-Please share your Wagtail HOWTOs, development notes, or site launches in the [Wagtail Slack workspace](https://github.com/wagtail/wagtail/wiki/Slack) in #watercooler, or feel free to reach out directly via [email](mailto:hello@wagtail.org).
+Please share your Wagtail HOWTOs, development notes, or site launches in the [Wagtail Slack workspace](https://github.com/wagtail/wagtail/wiki/Slack) in #watercooler, or feel free to reach out directly via [email](mailto:hello@wagtail.org).

docs/contributing/documentation_guidelines.md

@@ -89,7 +89,7 @@ Use **bold** and _italic_ sparingly and inline `code` when relevant.
 Use **bold** and _italic_ sparingly and inline `code` when relevant.
 ```
 
-Keep in mind that in reStructuredText, italic is written with `*`, and inline code must be written with double backticks, like ``` ``code`` ```.
+Keep in mind that in reStructuredText, italic is written with `*`, and inline code must be written with double backticks, like ` ``code`` `.
 
 ```rst
 Use **bold** and *italic* sparingly and inline ``code`` when relevant.
@@ -181,8 +181,6 @@ print("Hello, world!")
 ````
 `````
 
-
-
 <details>
 
 <summary>Rendered output</summary>