doc: Add changelog entry

Author: effigies

changelog.d/20250822_102838_markiewicz_faq.md

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+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
+-->
+
+### Added
+
+- Added a [FAQ] to the user guide. ([#215])
+
+[FAQ]: https://bids-validator.readthedocs.io/en/latest/user_guide/faq.html
+[#215]: https://github.com/bids-standard/bids-validator/issues/215
+
+<!--
+### Changed
+
+- A bullet item for the Changed category.
+
+-->
+<!--
+### Fixed
+
+- A bullet item for the Fixed category.
+
+-->
+<!--
+### Deprecated
+
+- A bullet item for the Deprecated category.
+
+-->
+<!--
+### Removed
+
+- A bullet item for the Removed category.
+
+-->
+<!--
+### Security
+
+- A bullet item for the Security category.
+
+-->
+<!--
+### Infrastructure
+
+- A bullet item for the Infrastructure category.
+
+-->