[Chapel Merge] Fix a typo in the IO documentation

Branch: refs/heads/main
Revision: bf9c9fd
Author: lydia-duncan
Link: Fix a typo in the IO documentation by lydia-duncan · Pull Request #19850 · chapel-lang/chapel · GitHub
Log Message:

Merge pull request #19850 from lydia-duncan/fixDocTypo

Fix a typo in the IO documentation
[very minor, not reviewed]

The touched line was missing a period between sentences. Noticed while
reviewing the open* functions.

Double checked the built docs

Modified Files:
M modules/standard/IO.chpl

Compare: https://github.com/chapel-lang/chapel/compare/8aa8a436bc8b...bf9c9fd0d2bb