docs: Clarify no-div-regex rule docs (#17051) (#17255)

* fix: Clarify `no-div-regex` rule docs

* Update opening section



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Co-authored-by: Milos Djermanovic <milos.djermanovic@gmail.com>

docs/src/rules/no-div-regex.md

@@ -8,15 +8,15 @@ related_rules:
 
 
 
-Require regex literals to escape division operators.
+Characters `/=` at the beginning of a regular expression literal can be confused with a division assignment operator.
 
 ```js
 function bar() { return /=foo/; }
 ```
 
 ## Rule Details
 
-This is used to disambiguate the division operator to not confuse users.
+This rule forbids equal signs (`=`) after the slash (`/`) at the beginning of a regular expression literal, because the characters `/=` can be confused with a division assignment operator.
 
 Examples of **incorrect** code for this rule: