Update changelog

Author: pdsen-ci

CHANGELOG.md

@@ -1,11 +1,12 @@
 # Changelog
 
-## [«unknown»](https://github.com/NASA-PDS/validate/tree/«unknown») (2024-06-10)
+## [«unknown»](https://github.com/NASA-PDS/validate/tree/«unknown») (2024-06-11)
 
 [Full Changelog](https://github.com/NASA-PDS/validate/compare/v3.5.1...«unknown»)
 
 **Defects:**
 
+- Missing operation documentation [\#933](https://github.com/NASA-PDS/validate/issues/933) [[s.high](https://github.com/NASA-PDS/validate/labels/s.high)]
 - Validate throws an error when UnsignedBitString has 61 bits [\#919](https://github.com/NASA-PDS/validate/issues/919) [[s.medium](https://github.com/NASA-PDS/validate/labels/s.medium)]
 - context\_ref\_mismatch does not run except when -R pds4.label [\#915](https://github.com/NASA-PDS/validate/issues/915) [[s.low](https://github.com/NASA-PDS/validate/labels/s.low)]
 - Validate 3.5.0-snapshot gives error when encountering Document objects/files used in other Document products. [\#905](https://github.com/NASA-PDS/validate/issues/905) [[s.medium](https://github.com/NASA-PDS/validate/labels/s.medium)]