Formatting & grammar
----------
Third Party Identifiers (3PIDs) represent identifiers on other namespaces that
might be associated with a particular person. They comprise a tuple of ``medium``
-which is a string that identifies the namespace in which the identifier exists
+which is a string that identifies the namespace in which the identifier exists,
and an ``address``: a string representing the identifier in that namespace. This
-must be a canonical form of the identifier, ie. if multiple strings could
+must be a canonical form of the identifier, *ie.* if multiple strings could
represent the same identifier, only one of these strings must be used in a 3PID
address, in a well-defined manner.
