[skip ci] Issue templates: remove unused optional fields

.github/ISSUE_TEMPLATE/request-a-new-feature.md

@@ -1,9 +1,6 @@
 ---
 name: Request a New Feature
 about: For requesting new feature(s) to be added to the docs.
-title: ''
-labels: ''
-assignees: ''
 ---
 
 ## Related Issues

.github/ISSUE_TEMPLATE/request-an-update.md

@@ -1,9 +1,6 @@
 ---
 name: Request an Update
 about: For fixing docs errors/typos, adding needed/missing information, updating verbiage, deleting outdated info, etc.
-title: ''
-labels: ''
-assignees: ''
 ---
 
 ## Related Issues