Section on MPI_Session_init does not describe its semantics

[devreal]

Problem

Section 11.3.1 (MPI_Session_init) does not say what this function actually does. There should at least be a pointer to a place that defines the semantics, if it is defined elsewhere.

Readers looking for MPI_Session_init in the document will have a hard time to understand what this function does if they just go to Section 11.3.1.

Proposal

Add a short paragraph describing the semantics of MPI_Session_init or a pointer to where it is defined.

Changes to the Text

TBD

Impact on Implementations

None

Impact on Users

Better readability for sessions users.

References and Pull Requests