[MBUILDCACHE-121] Clarify meaning of adjustMetaInf parameter

**[Gili](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=cowwoc)** opened **[MBUILDCACHE-121](https://issues.apache.org/jira/browse/MBUILDCACHE-121?redirect=false)** and commented

https://maven.apache.org/extensions/maven-build-cache-extension/build-cache-config.html#projectversioning defines `adjustMetaInf` as "Determines whether version in metadata must be changed according to building project version."

It's not clear what this means, and how it differs from `calculateProjectVersionChecksum` which is defined as "Determines whether project version should be included to calculate checksum input."

I understand what `calculateProjectVersionChecksum`  means, but I'm not sure about `adjustMetaInf.`

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**Affects:** 1.2.0

Start with the projectversioning documentation linked in the issue, reading the definitions of adjustMetaInf and calculateProjectVersionChecksum together. Clarify what adjustMetaInf changes and how it differs from checksum calculation; done means a reader can distinguish the two settings without additional context.

Written by the indexing model from the issue text.