Add release notes for v2.1.1

[maximlt]

Version 2.1.1

Date: 2024-06-25

This minor release contains bug fixes for reactive expressions and a few minor documentation improvements. Thanks to @jrycw for their first contribution! And to @ahuang11, @maximelt, and @philippjfr for their continued maintenance and development efforts.

Bug fixes:

• Ensure rx._callback resolves accessors (#949)
• Ensure refs can be updated by watcher of the same parameter (#929)
• Recursively resolve references on args and kwargs passed to a reactive operation (#944)
• Only override the name of a Parameterized instance on Parameter instantiation when instantiate=True (#938)

Documentation:

• Various minor documentation improvements (#933, #935, #941, #947)

Maintenance:

• Fix test_reactive_logic_unary_ops on Python 3.12 (#946)

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