[andygrove]

Which issue does this PR close?

Part of #6550.

Rationale for this change

docs/source/changelog/1.2.0.md was generated by dev/release/generate-changelog.py in #7290 (with #7281 added by #7291). Three backports have landed or are about to land on branch-1.2 since, so the changelog does not list them. Regenerating would not pick up #7281 again (see #7291), so the entries are added by hand.

What changes are included in this PR?

Adds three entries to "Fixed bugs" in docs/source/changelog/1.2.0.md, in the format the script prints:

• fix: [branch-1.2] match Spark nullness for missing nested Parquet fields (#7085) #7313 (backport of fix: match Spark nullness for missing nested Parquet fields #7085), merged
• fix: [branch-1.2] decode invalid UTF-8 in nested Parquet BINARY values read as strings (#7106) #7339 (backport of fix: decode invalid UTF-8 in nested Parquet BINARY values read as strings #7106), merged
• fix: [branch-1.2] apply the session's Comet configs in map stages of jobs outside a SQL execution (#7302) #7337 (backport of fix: apply the session's Comet configs in map stages of jobs outside a SQL execution #7302), not merged yet. It is included ahead of time, so this PR should merge after fix: [branch-1.2] apply the session's Comet configs in map stages of jobs outside a SQL execution (#7302) #7337.

It also raises the commit count from 396 to 399 and adds one to the credits of each author of those PRs: Andy Grove (2), KUAN-HAO HUANG, Manu Zhang and Oleks V. The Claude co-author on #7339 is not credited, as the script does not credit it.

#7314 (the backport of #7260) is still open and is not included.

How are these changes tested?

Prettier passes on the file. The titles, links and authors match the pull requests.

[comphead]

Thanks @andygrove