This imports the function-specifics that were documented in the Application Developer's Guide, section "IOC Shell". Other changes include: - Removing unneeded "@typedef" and "@enum" - Adding "()" and "@ref" for interlinking - Removing duplicated documentation between iocsh & iocshLoad, and iocshCmd & iocshRun Supports the PR: https://github.com/epics-docs/epics-docs/pull/141