Improve documentation to clearly state that Query By Example ignores collections [DATAJPA-1127]

[spring-projects-issues]

Jens Schauder opened DATAJPA-1127 and commented

This limitation is currently not present in the limitations section but in a note further down. And also in a wording that is hard to understand (and find) for users

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Issue Links:

• DATACMNS-1086 Example for how to restructure documentation

• DATACMNS-1811 The limitation section for Query By Example should explicitly mention that collection valued properties get ignored