[DOCS][release notes] term dict memory usage is a 7.3.0 enhancement, not 7.2.0

[inqueue]

7.2.0 release notes mention this change:

Use reader attributes to control term dict memory useage #42838 (issue: #38390)

#42838 was originally labeled 7.2.0. The change was not committed until 7.3.0.

Please correct the release notes for 7.2.0 and 7.3.0.

[elasticmachine]

Pinging @elastic/es-docs

[qianyuxiang01]

I have move the release note entry from branch 7.2 to branch 7.3

[javanna]

This is now fixed.