Other minor updates

[wgropp]

Problem

In reviewing the mpi-50-rc of February 2025, several items that could be improved were identified. They are:

1. p 375. The example in Section 7.7.6 should go into an example environment.
2. p 379, lines 13-22. This doesn't explain why an info was not used.
3. p 496, figure 11. The text in the boxes is too small. I have raised this before. The text should be at least 10pt.
4. p935. There are many function names here without links. Nothing in this appendix should be the primary definition of any function. E.g., why isn't MPI_Comm_fromint a link to the definition of MPI_Comm_fromint?

Proposal

Update the text to address these issues

Changes to the Text

To be determined

Impact on Implementations

None

Impact on Users

Improved document

References and Pull Requests