Sanitize the term "combo CID" in code comments

Michael Paquier <michael@paquier.xyz>

Commit: a1999a01bb56c5f5451116abe61b892b2eec5e49
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-03-25T07:08:03Z
Releases: 14.0
Sanitize the term "combo CID" in code comments

Combo CIDs were referred in the code comments using different terms
across various places of the code, so unify a bit the term used with
what is currently in use in some of the READMEs.

Author: "Hou, Zhijie"
Discussion: https://postgr.es/m/1d42865c91404f46af4562532fdbea31@G08CNEXMBPEKD05.g08.fujitsu.local

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