Add release notes explaning FERC 1 metadata cleanup

[zaneselvans]

PR Overview

@cmgosnell & @e-belfer I noticed that we haven't really been documenting our cleanup of the FERC 1 metadata / calculations in the release notes, which seems like it'll be helpful. I added a note about adding the correction records, if y'all want to add your own notes about what you've done and the issues / PRs that would be great!

PR Checklist

• Merge the most recent version of the branch you are merging into (probably dev).
• All CI checks are passing. Run tests locally to debug failures
• Make sure you've included good docstrings.
• For major data coverage & analysis changes, run data validation tests
• Include unit tests for new functions and classes.
• Defensive data quality/sanity checks in analyses & data processing functions.
• Update the release notes and reference reference the PR and related issues.
• Do your own explanatory review of the PR to help the reviewer understand what's going on and identify issues preemptively.

[codecov]

Codecov Report

Patch coverage: 94.3% and project coverage change: +0.2 🎉

Comparison is base (fe395c9) 86.9% compared to head (a335fe8) 87.2%.

❗ Current head a335fe8 differs from pull request most recent head 4c7e69b. Consider uploading reports for the commit 4c7e69b to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             dev   #2626     +/-   ##
=======================================
+ Coverage   86.9%   87.2%   +0.2%     
=======================================
  Files         84      86      +2     
  Lines       9720   10001    +281     
=======================================
+ Hits        8447    8721    +274     
- Misses      1273    1280      +7     

Impacted Files	Coverage Δ
src/pudl/metadata/fields.py	100.0% <ø> (ø)
src/pudl/metadata/resources/ferc1.py	100.0% <ø> (ø)
src/pudl/metadata/sources.py	100.0% <ø> (ø)
src/pudl/transform/params/ferc1.py	100.0% <ø> (ø)
src/pudl/extract/xbrl.py	94.2% <33.3%> (-2.8%)	⬇️
src/pudl/ferc_to_sqlite/cli.py	70.7% <71.4%> (-0.7%)	⬇️
src/pudl/workspace/datastore.py	75.6% <71.4%> (+2.5%)	⬆️
src/pudl/extract/dbf.py	88.8% <87.8%> (-0.2%)	⬇️
src/pudl/extract/ferc.py	91.6% <91.6%> (ø)
src/pudl/transform/ferc1.py	96.6% <98.6%> (+0.4%)	⬆️
... and 4 more

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