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Your release notes are in good order.

Here is what the release notes will look like:

• matrices

  • Made type aliases for Matrix and MutableMatrix compliant with PEP 484 (#23659 by @agryman)

  • This enables mypy to recognize the type aliases (#23659 by @agryman)

This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.11.

PEP 484 specifies that type alias assignments must be simple. The type alias for Matrix was defined in a chained assignment. This broke mypy. I split the chained assignment into two simple assignments.

Refer to issue #23647.

<!-- BEGIN RELEASE NOTES -->
* matrices
  * Made type aliases for Matrix and MutableMatrix compliant with PEP 484
  * This enables mypy to recognize the type aliases 
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

Benchmark results from GitHub Actions

Lower numbers are good, higher numbers are bad. A ratio less than 1
means a speed up and greater than 1 means a slowdown. Green lines
beginning with + are slowdowns (the PR is slower then master or
master is slower than the previous release). Red lines beginning
with - are speedups.

Significantly changed benchmark results (PR vs master)

Significantly changed benchmark results (master vs previous release)

       before           after         ratio
     [77f1d79c]       [3e51f99f]
     <sympy-1.10.1^0>                 
+      98.2±0.7ms          179±1ms     1.82  sum.TimeSum.time_doit

Full benchmark results can be found as artifacts in GitHub Actions
(click on checks at the top of the PR).