Replace potentially insensitive language with more neutral language.

Note that problematic words in the code have
to remain in the docs until the code changes.

• You have read the Spring Data contribution guidelines.
• You created a JIRA ticket in the bug tracker for the project.
• You formatted the code according to the source code style provided here and have specifically applied them to your changes. Do not submit any formatting related changes.
• You submitted test cases (Unit or Integration Tests) backing your changes.
• You added yourself as the 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).
• If applicable, you have complied with and taken steps necessary to report any security vulnerabilities at Pivotal Security Reporting.