Define what counts as a symbol in the Symbol filter doc

[styler]

Closes #84.

The Symbol filter page never said what a "symbol" actually is, so readers couldn't tell whether spaces count (they don't — see the discussion on the issue).

Checked against the filter's actual behaviour and added a short definition: a symbol is any character that isn't a letter, a number, or a space — punctuation, math/currency signs, and Unicode emoji all count. Platform emotes are sent as plain words, so they don't.

Two corrections along the way:

• Minimum amount was described as a minimum symbol count, but it's really a minimum message length gate — messages shorter than it are never checked at all.
• Maximum percent now says the percentage is measured against all characters in the message, spaces included.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	docs	78fa87c	Jul 18 2026, 03:43 PM