bug#57469: Missing information about all the modes that fall under prog-mode.

[Gregory Heytings]

> OP does not want examples, but the actual list of language major-modes.

antlr-mode asm-mode autoconf-mode awk-mode bat-mode cfengine2-mode 
cfengine3-mode c++-mode c-mode cperl-mode css-mode dcl-mode dsssl-mode 
edebug-eval-mode elisp-byte-code-mode emacs-lisp-mode erts-mode f90-mode 
fortran-mode gdb-script-mode gnus-edit-form-mode gnus-kill-file-mode 
gnus-score-mode help-fns--edit-value-mode icon-mode idl-mode idlwave-mode 
java-mode js-json-mode js-jsx-mode js-mode ld-script-mode less-css-mode 
lisp-data-mode lisp-interaction-mode lisp-mode m2-mode m4-mode 
makefile-automake-mode makefile-bsdmake-mode makefile-gmake-mode 
makefile-imake-mode makefile-makepp-mode makefile-mode mercury-mode 
meta-common-mode metafont-mode metapost-mode mixal-mode objc-mode 
octave-mode opascal-mode pascal-mode perl-mode pike-mode plstore-mode 
prolog-mode ps-mode python-mode ruby-mode scheme-mode scss-mode sh-mode 
sieve-mode simula-mode sql-mode tcl-mode vera-mode verilog-mode vhdl-mode