fix: help mentions --gcov alias (fixes #1213)

Author: krystophny

src/config/help/config_help_core.f90

@@ -20,7 +20,7 @@ subroutine show_help_information()
         print '(A)', "Usage: fortcov [OPTIONS] [COVERAGE_FILES...]"
         print '(A)', ""
         print '(A)', "Note: FortCov analyzes existing .gcov files by default."
-        print '(A)', "      Use --discover-and-gcov to auto-discover builds and run gcov."
+        print '(A)', "      Use --gcov (alias: --discover-and-gcov) to auto-discover builds and run gcov."
         print '(A)', ""
         print '(A)', "Options:"
         print '(A)', "  -h, --help                Show this help and exit"
@@ -39,11 +39,12 @@ subroutine show_help_information()
         print '(A)', "  --fail-under PERCENT      Exit non-zero if coverage below PERCENT"
         print '(A)', ""
         print '(A)', "Automation:"
-        print '(A)', "  --discover-and-gcov       Auto-discover builds and run gcov before analysis"
+        print '(A)', "  --gcov                    Auto-discover builds and run gcov before analysis"
+        print '(A)', "                             (alias: --discover-and-gcov)"
         print '(A)', ""
         print '(A)', "Examples:"
         print '(A)', "  fortcov --source=src *.gcov --output=report.md"
-        print '(A)', "  fortcov --discover-and-gcov --fail-under 80"
+        print '(A)', "  fortcov --gcov --fail-under 80"
         print '(A)', ""
         print '(A)', "For more information, visit: https://github.com/lazy-fortran/fortcov"