Docs: Fix typo in timestamp-field.asciidoc

Closes #6661

docs/reference/mapping/fields/timestamp-field.asciidoc

@@ -56,7 +56,7 @@ Will cause `2009-11-15T14:12:12` to be used as the timestamp value for:
 }
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-Note, using `path` without explicit timestamp value provided require an
+Note, using `path` without explicit timestamp value provided requires an
 additional (though quite fast) parsing phase.
 
 [float]