add short titles to frontmatter (#20131)

content/github/writing-on-github/working-with-advanced-formatting/autolinked-references-and-urls.md

@@ -8,6 +8,7 @@ versions:
   fpt: '*'
   ghes: '*'
   ghae: '*'
+shortTitle: Auto linked references
 ---
 ## URLs
 

content/github/writing-on-github/working-with-advanced-formatting/creating-a-permanent-link-to-a-code-snippet.md

@@ -11,6 +11,7 @@ versions:
   ghae: '*'
 topics:
   - Pull requests
+shortTitle: Permanent links to code
 ---
 This type of permanent link will render as a code snippet only in the repository it originated in. In other repositories, the permalink code snippet will render as a URL.
 

content/github/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks.md

@@ -8,6 +8,7 @@ versions:
   fpt: '*'
   ghes: '*'
   ghae: '*'
+shortTitle: Create code blocks
 ---
 
 ## Fenced code blocks

content/github/writing-on-github/working-with-advanced-formatting/index.md

@@ -14,5 +14,6 @@ children:
   - /attaching-files
   - /creating-a-permanent-link-to-a-code-snippet
   - /using-keywords-in-issues-and-pull-requests
+shortTitle: Work with advanced formatting
 ---
 

content/github/writing-on-github/working-with-advanced-formatting/organizing-information-with-tables.md

@@ -8,6 +8,7 @@ versions:
   fpt: '*'
   ghes: '*'
   ghae: '*'
+shortTitle: Organized data with tables
 ---
 ## Creating a table