Rollup merge of #63360 - brson:cz-help, r=Mark-Simulacrum
Rollup merge of #63360 - brson:cz-help, r=Mark-Simulacrum

Use consistent capitalization in -C/-Z help

This code could also use a pass to consistify the grammar, but not by me atm.

aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust