DOCS: Converted the 'list items' to 'Markdown header #4'.

documentation/styleguide-doc.md

@@ -96,7 +96,7 @@ The code goes here.
 
 ### Technical references
 
-* Mentioning language features:
+#### Mentioning language features:
 
 Not every mention to A, CNAME, or function
 needs to be a link to the manual for that record type.
@@ -107,31 +107,31 @@ be a link.  Others are at the authors digression.
 The [`PTR`](functions/domain/PTR.md) feature is helpful in LANs.
 ```
 
-* Mentioning functions from the source code:
+#### Mentioning functions from the source code:
 
 ```markdown
 The function `GetRegistrarCorrections()` returns...
 ```
 
 ### Links
 
-* Internal links:
+#### Internal links:
 
 ```markdown
 Blah blah blah [M365_BUILDER](functions/record/M365_BUILDER.md)
 ```
 
 NOTE: The `.md` is required.
 
-* Link to another website:
+#### Link to another website:
 
 Just list the URL.
 
 ```markdown
 Blah blah blah <https://www.google.com> blah blah.
 ```
 
-* Link with anchor text:
+#### Link with anchor text:
 
 ```markdown
 Blah blah blah [a search engine](https://www.google.com) blah blah.