There are two tags right now that should be changed. solidity-0.5.0 and solidity-0.6.0 by definition refer to a very specific subversion of Solidity (0.5.0 and 0.6.0, respectively), however these tags are used for all subversions of the specific version (e.g., people will use solidity-0.5.0 for questions pertaining to version 0.5.1 of Solidity).
Thank you for raising this and the helpful suggestion: both tags have been updated.
In case people were interested, this is one output from moderator tool:
Preview tag rename Be careful! There is no revision history generated by this action!
Remember that caching of question lists may make it look like the tag still exists after the merge, but it doesn't!
solidity-0.5.0 will be removed from 89 questions
solidity-0.5.x will be added to 89 questions
(These counts include deleted questions and exclude overlapping tags.)