docs: Update SIP template

[john-bodley]

SUMMARY

Adding documentation regarding numbering of SIPs.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

CI.

ADDITIONAL INFORMATION

• Has associated issue:
• 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 #14278 (792929f) into master (70cfb77) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #14278    +/-   ##
========================================
  Coverage   77.01%   77.01%            
========================================
  Files         954      954            
  Lines       48066    48066            
  Branches     5973     5547   -426     
========================================
  Hits        37016    37016            
- Misses      10848    10853     +5     
+ Partials      202      197     -5     

Flag	Coverage Δ
hive	80.44% <ø> (ø)
javascript	72.10% <ø> (ø)
mysql	80.72% <ø> (ø)
postgres	80.76% <ø> (+0.01%)	⬆️
presto	80.45% <ø> (ø)
python	81.29% <ø> (ø)
sqlite	80.36% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...end/src/SqlLab/components/RunQueryActionButton.tsx	64.28% <0.00%> (ø)
...d/src/filters/components/GroupBy/transformProps.ts	33.33% <0.00%> (ø)
...src/filters/components/TimeGrain/transformProps.ts	33.33% <0.00%> (ø)
...rc/filters/components/TimeColumn/transformProps.ts	33.33% <0.00%> (ø)
...ts/nativeFilters/FilterBar/FilterControls/state.ts	80.00% <0.00%> (ø)

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