chore(issue template): attempting to fix two entries/links (apache#25881

)

Co-authored-by: Sam Firke <sfirke@users.noreply.github.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -8,5 +8,5 @@ contact_links:
     url: https://github.com/apache/superset/discussions/new?category=q-a-help
     about: Open a community Q&A thread on GitHub Discussions
   - name: Slack
-    url: bit.ly/join-superset-slack
-    about: Join the Superset Community on Slack for other discussions/assistance
+    url:  https://bit.ly/join-superset-slack
+    about: Join the Superset Community on Slack for other discussions and assistance

.github/ISSUE_TEMPLATE/sip.md

@@ -1,13 +1,13 @@
 ---
 name: SIP
-about: "Superset Improvement Proposal. See https://github.com/apache/superset/issues/5602 for details. The purpose of a Superset Improvement Proposal (SIP) is to introduce any major change into Apache Superset, such as a major new feature, subsystem, or piece of functionality, or any change that impacts the public interfaces of the project"
+about: "Superset Improvement Proposal. See SIP-0 (https://github.com/apache/superset/issues/5602) for details. A SIP introduces any major change into Apache Superset's code or process."
 labels: sip
 title: "[SIP] Your Title Here (do not add SIP number)"
 assignees: "apache/superset-committers"
 ---
 
 *Please make sure you are familiar with the SIP process documented*
-(here)[https://github.com/apache/superset/issues/5602]. The SIP will be numbered by a committer upon acceptance.
+[here](https://github.com/apache/superset/issues/5602). The SIP will be numbered by a committer upon acceptance.
 
 ## [SIP] Proposal for ...<title>