update security paragraph after suggestion commit

Author: gregsdennis

specs/jsonschema-core.md

@@ -1991,12 +1991,10 @@ material within a `$comment`. Implementations MUST NOT parse or otherwise take
 action based on `$comment` contents.
 
 When encountering an IRI that also represents a valid file system or network
-location, implementations are discouraged from automatically making an operation to
-access that location. Implementations that choose to support retrieval over untrusted
-connections should require users to configure the implementation to enable that 
-functionality.
-implementations to operate over a file system or network as this could expose
-the host system.
+location, implementations are discouraged from automatically making an operation
+to access that location. Implementations that choose to support retrieval over
+untrusted connections should require users to configure the implementation to
+enable that functionality.
 
 ## IANA Considerations