doc: fix small logic error in DETECT_MODULE_SYNTAX

PR-URL: #62025
Reviewed-By: Jacob Smith <jacob@frende.me>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

Author: Renegade334

doc/api/esm.md

@@ -1263,7 +1263,7 @@ _isImports_, _conditions_)
 >    2. If _source_ contains a top-level lexical declaration (`const`, `let`,
 >       or `class`) of any of the CommonJS wrapper variables (`require`,
 >       `exports`, `module`, `__filename`, or `__dirname`) then return **true**.
-> 3. Else return **false**.
+> 3. Return **false**.
 
 ### Customizing ESM specifier resolution algorithm