Clarify semantic versioning approach

As raised in the PyAnsys dev meeting, we should clarify that we are following Semantic versioning for our PyAnsys packages. We are also mentioning that we are following what other major players are doing... and they are not actually following SemVer. That statament should be removed.

Overall, we might want to rewrite that section for major clarification. See https://dev.docs.pyansys.com/how-to/releasing.html#semantic-versioning

Start with the Semantic Versioning section at https://dev.docs.pyansys.com/how-to/releasing.html#semantic-versioning and compare its claims with the issue description. Remove the statement about following what other major players do, clarify that PyAnsys packages follow Semantic Versioning, and ensure the section reads consistently.

Written by the indexing model from the issue text.