Remove punctuation in Exception messages #2603

[aml8801]

First part to close #2603

• You have read the Spring Data contribution guidelines.
• You use the code formatters provided here and have them applied to your changes. Don’t submit any formatting related changes.
• You submit test cases (unit or integration tests) that back your changes.
  -> since I did not add/update any business logic, I did not add tests.
• You added yourself as author in the headers of the classes you touched. Amend the date range in the Apache license header if needed. For new types, add the license header (copy from another file and set the current year only).

[jxblum]

This PR has been merged to 2.6.x, 2.7.x and main (3.0). Thank you again for the contribution.