Apply suggestions from code review

Co-authored-by: Matthew Hodgson <matthew@matrix.org>

content/_index.md

@@ -233,7 +233,7 @@ reserved for events defined in the Matrix specification - for instance
 usually sent in the context of a "Room".
 
 {{% boxes/warning %}}
-Event bodies are considered untrusted data. This means that anyone using
+Event bodies are considered untrusted data. This means that any application using
 Matrix must validate that the event body is of the expected shape/schema
 before using the contents verbatim.
 

content/client-server-api/_index.md

@@ -1382,7 +1382,7 @@ available room versions.
 {{% /boxes/warning %}}
 
 {{% boxes/warning %}}
-Event bodies are considered untrusted data. This means that anyone using
+Event bodies are considered untrusted data. This means that any application using
 Matrix must validate that the event body is of the expected shape/schema
 before using the contents verbatim.