Fix typo in webserver.rst (#17288)
Fix typo in webserver.rst (#17288)

Porting https://github.com/apache/airflow-site/pull/454 to Airflow docs. Added @pumpkiny9120 as co-author

Co-authored-by: Yanan Valencia <9f54d96f191886436bfa7fa0af71bc6ff0fb8093@gmail.com>
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