Fix typo in doc

Description

Fix grammatical typo in documentation.
First contribution this year

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• Docs (changes to the documentation)

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docs/operation/webservice.md

@@ -42,7 +42,7 @@ As shown below this is a screenshot showing proposal 5438 when it had a `Beamlin
 
 ## job monitor
 
-The Job DB is regularly monitored by a separate and a dedicated service. Below is a screenshot for it's logs through the [webservice overview page](#webservice-overview).
+The Job DB is regularly monitored by a separate and dedicated service. Below is a screenshot for its logs through the [webservice overview page](#webservice-overview).
 
 ![webservice job monitor](../static/webservice/webservice_job_db.png)