Create documentation-request.md

.github/ISSUE_TEMPLATE/documentation-request.md

@@ -0,0 +1,16 @@
+---
+name: Documentation Update Request
+about: Request an addition, correction or update to documentation
+title: ''
+labels: documentation
+assignees: ''
+
+---
+
+** Requested Change **
+What you would like to see updated (or added) to documentation
+
+** Relevant existing documentation **
+A link to any existing documentation, with page number if appropriate
+
+