Change USE to ebnf and cleanup sqlgram

[dveeden]

What is changed, added or deleted? (Required)

• Change USE docs to use ebnf
• Cleanup sqlgram files

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What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

#4389

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[dveeden]

For the cleanup I used this:

for n in media/sqlgram/*png; do x=$(git grep $n | wc -l); [[ $x == 0 ]] && rm $n; done

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[LGTM Timeline notifier]

Timeline:

• 2024-01-19 04:27:31.215389659 +0000 UTC m=+502892.779687362: ☑️ agreed by ran-huang.

[ran-huang]

/approve

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