Add new documentation issue type to github templates (#1000)

.github/ISSUE_TEMPLATE/documentation.md

@@ -0,0 +1,31 @@
+---
+name: Documentation Change
+about: Request or report any updates to our documentation (https://jrnl.sh)
+title: ''
+labels: ":new:, Documentation"
+assignees: ''
+
+---
+
+## Documentation Change
+<!--
+Hello, and thank you for reporting an issue!
+Please fill out the points below, as it will make our process much easier.
+-->
+
+### Affected Page(s)
+<!--
+Please tell us which page, or pages, from the documentation site (https://jrnl.sh) are
+affected in this issue
+-->
+  - <!-- example: https://jrnl.sh/overview -->
+
+### What's wrong?
+<!--
+Please write a short description of what is happening.
+-->
+
+### Other Information
+<!--
+Is there anything else we should know that might be helpful?
+-->