Tweak pull request template to (hopefully) make it clearer (#7287)

Marshall Bowers created 2 years ago

I keep seeing people leave the wrapping parentheses, like `(Added)` in
their release notes.

This PR tries making it clearer that we only want *one* of "Added",
"Fixed", or "Improved".

Release Notes:

- N/A

Change summary

.github/pull_request_template.md | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

Detailed changes

.github/pull_request_template.md

@@ -2,4 +2,8 @@
 
 Release Notes:
 
-- (Added|Fixed|Improved) ... ([#<public_issue_number_if_exists>](https://github.com/zed-industries/zed/issues/<public_issue_number_if_exists>)).
+- Added/Fixed/Improved ... ([#<public_issue_number_if_exists>](https://github.com/zed-industries/zed/issues/<public_issue_number_if_exists>)).
+
+**or**
+
+- N/A