[Chapel Merge] Update docs to use operator =

Branch: refs/heads/main
Revision: 8c13c21
Author: aconsroe-hpe
Log Message:

Merge pull request #18527 from aconsroe-hpe/docs-operator-equals

Update docs to use operator =

reviewed by @lydia-duncan

I saw these two places in the docs that were still using proc =.

Modified Files:
M doc/rst/language/spec/records.rst

M doc/rst/technotes/initequals.rst

Compare: https://github.com/chapel-lang/chapel/compare/ac72d7ec1bca...8c13c218e06a