docs: update example commands syntax of "brew help"

[egypcio]

by merging this change, we:

• make brew help consistent when listing example commands;
• update the "example usage" and "troubleshooting" sections so far.

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[bevanjkay]

If the change below is being made, the others may as well be updated to be consistent too.

[egypcio]

oh, that was indeed a nice catch! 😅
thanks!!1 patching right away...

[egypcio]

✅ 6012334

also changed the title of this PR accordingly 👍

dito, for the PR's description. commit logs were already clear

[MikeMcQuaid]

This change is not correct. The existing syntax means "these are required arguments".