Update docs/deployment/caching/etags.md

Author: jensens

docs/deployment/caching/etags.md

@@ -12,7 +12,7 @@ myst:
 # ETags
 
 ETags are used in to determine whether pages need to be re-calculated or can be served from cache.
-An ETag generated by `plone.app.caching' is a string of tokens separated by pipe characters that hold values like a user ID, the current skin name, or a counter indicating how many objects have been added to the site.
+An ETag generated by `plone.app.caching` is a string of tokens separated by pipe characters that hold values like a user ID, the current skin name, or a counter indicating how many objects have been added to the site.
 This technique is used to quickly calculate the current ETag for the requested resource. 
 The browser sends a request with the ETag included in an `If-None-Match` header, and if the ETag is the same, Plone responds with a 304 NOT MODIFIED message, indicating that the browser should use its cached copy. 
 If the ETag is different, Plone renders the page and returns it as normal.