Update src/common/unicode/README.

Jeff Davis <jdavis@postgresql.org>

Commit: f9f3fb1cb71a6cf28283a8cc3185599ec0ce94d3
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2024-03-18T23:39:29Z
Releases: 17.0
Update src/common/unicode/README.

Change the test description to include the case mapping
test. Oversight in 5c40364dd6.

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src/common/unicode/README modified +7 −8