ocaml*: add ocamlopt and ocamlfind and extend ocamlc (#4436)

pages/common/ocamlc.md

@@ -2,6 +2,7 @@
 
 > The OCaml bytecode compiler.
 > Produces executables runnable by the OCaml interpreter.
+> More information: <https://ocaml.org>.
 
 - Create a binary from a source file:
 
@@ -10,3 +11,7 @@
 - Create a named binary from a source file:
 
 `ocamlc -o {{path/to/binary}} {{path/to/source_file.ml}}`
+
+- Automatically generate a module signature (interface) file:
+
+`ocamlc -i {{path/to/source_file.ml}}`