Update peps/pep-0694.rst

Author: ewdurbin

peps/pep-0694.rst

@@ -746,7 +746,7 @@ File Upload Mechanisms
 
 File Upload Mechanisms, with the exception of ``http-post-application-octet-stream`` are left as an
 implementation detail specific to each server. Servers **MUST** implement a
-``http-post-application-octet-stream`` mechanism as a fallback if no server specific implementations
+``http-post-application-octet-stream`` mechanism. This serves as a fallback if no server specific implementations
 exist.
 
 A given server may implement an arbitrary number of mechanisms and is responsible for documenting