README.rst: Fix typo (#4229)

README.rst

 | 2.2 LTS | August 2023    |
 +---------+----------------+
 
-Supported verions are eligible for fixes for data loss bugs and security issues. Releases designated as
+Supported versions are eligible for fixes for data loss bugs and security issues. Releases designated as
 Long-term support (LTS) releases will receive support for an extended period of 3 years from their release date.