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

[rusackas]

SUMMARY

Two things here:

1. The SIP button recently disappeared. I think it might be due to the bad markdown link OR the fact that we had a URL sitting there as a (non-working) markdown link. This adds parenthesis back to it, for good measure.

2. The Slack link wasn't working. I assume it's because the string contained a slash that was causing a parsing error. Hopefully this fixes it? ¯\_(ツ)_/¯

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #25881 (4677e05) into master (887be5d) will increase coverage by 0.01%.
Report is 23 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #25881      +/-   ##
==========================================
+ Coverage   69.00%   69.02%   +0.01%     
==========================================
  Files        1938     1938              
  Lines       75829    75829              
  Branches     8427     8427              
==========================================
+ Hits        52326    52340      +14     
+ Misses      21334    21314      -20     
- Partials     2169     2175       +6     

Flag	Coverage Δ
hive	53.66% <ø> (ø)
javascript	56.26% <ø> (+0.03%)	⬆️
mysql	78.25% <ø> (ø)
postgres	78.35% <ø> (ø)
presto	53.61% <ø> (ø)
python	82.78% <ø> (ø)
sqlite	77.00% <ø> (ø)
unit	55.50% <ø> (ø)

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see 2 files with indirect coverage changes

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[sfirke]

Shared one idea for URL formatting, LGTM though!