Ada: Fix reStructuredText markup
Corrected errors in reStructuredText markup within the Ada documentation.
This commit fixes reStructuredText markup errors in the Ada documentation, specifically in the building_executable_programs_with_gnat.rst file. The gnat_ugn.texi file was regenerated as a result.
In Details
This commit pertains to the Ada documentation within GCC. The reStructuredText markup in building_executable_programs_with_gnat.rst was corrected, and gnat_ugn.texi was regenerated. This change primarily affects the documentation build process.
For Context
This commit modifies the documentation for the Ada programming language within the GCC compiler collection. The documentation is written in reStructuredText, a plain-text markup syntax used to generate various output formats. This change ensures the documentation is correctly formatted, improving readability and accuracy for Ada developers using GCC.