Add pronunciation of Mac Option key symbol "⌥" (#14682)
NVDA doesn't announce the symbol that macs use to represent the mac "Option" key ("⌥") (see Mac keyboard shortcuts documentation).
Description of user facing changes
Adds a symbol description for this symbol ("mac Option key" announced at "none" level and up, similar to the existing entry for "mac Command key" at the "none" level for symbol "⌘").
Description of development approach
Followed the "Defining Symbol Information" developer documentation, using the existing "mac Command key" entry and similar recent PR #14548 as examples
Testing strategy:
Didn't attempt to adjust any automated tests (assumed they were already present generally for symbol pronunciation). Manually verified reading by:
runnvda.bat from this branch
Browse to Mac keyboard shortcuts docs
Read through the content under the "Mac keyboard shortcuts" H1, particularly the list item with content "Option (or Alt) ⌥"
Verify that the symbol is read out as "mac Option key" as expected
Change NVDA's "Settings > Speech > Punctuation/symbol level" to "none" and repeat above steps
