Add clarification on binary data and base64 encoding to Appendices (#3362)
Add clarification on binary data and base64 encoding to Appendices (#3362)

* Add clarification on binary data and base64 encoding (closes #3341)

* Add changelog fragment

* Delete 3362.clarification
matrix-org/matrix-doc,matrix-org/matrix-doc,matrix-org/matrix-doc,matrix-org/matrix-doc