Fix minor typos in documentation (#2769)

Co-authored-by: Martin Hořeňovský <martin.horenovsky@gmail.com>

docs/release-notes.md

@@ -381,7 +381,7 @@ v3 releases.
 * Added `STATIC_CHECK` macro, similar to `STATIC_REQUIRE` (#2318)
   * When deferred tu runtime, it behaves like `CHECK`, and not like `REQUIRE`.
 * You can have multiple tests with the same name, as long as other parts of the test identity differ (#1915, #1999, #2175)
-  * Test identity includes test's name, test's tags and and test's class name if applicable.
+  * Test identity includes test's name, test's tags and test's class name if applicable.
 * Added new warning, `UnmatchedTestSpec`, to error on test specs with no matching tests
 * The `-w`, `--warn` warning flags can now be provided multiple times to enable multiple warnings
 * The case-insensitive handling of tags is now more reliable and takes up less memory