c-doc-comment-style is a variable defined in `cc-vars.el'.
Its value is

*Specifies documentation comment style(s) to recognize.
This is primarily used to fontify doc comments and the markup within
them, e.g. Javadoc comments.

The value can be any of the following symbols for various known doc
comment styles:

javadoc -- Javadoc style for "/** ... */" comments (default in Java mode).
autodoc -- Pike autodoc style for "//! ..." comments (default in Pike mode).
gtkdoc -- GtkDoc style for "/** ... **/" comments (default in C mode).

The value may also be a list of doc comment styles, in which case all
of them are recognized simultaneously (presumably with markup cues
that don't conflict).

The value may also be an association list to specify different doc
comment styles for different languages. The symbol for the major mode
is then looked up in the alist, and the value of that element is
interpreted as above if found. If it isn't found then the symbol
`other' is looked up and its value is used instead.

Note that CC Mode uses this variable to set other variables that
handle fontification etc. That's done at mode initialization or when
you switch to a style which sets this variable. Thus, if you change
it in some other way, e.g. interactively in a CC Mode buffer, you will
need to do M-x java-mode (or whatever mode you're currently using) to

Note also that when CC Mode starts up, the other variables are
modified before the mode hooks are run. If you change this variable
in a mode hook, you have to call `c-setup-doc-comment-style'
afterwards to redo that work.

This is a style variable. Apart from the valid values described
above, it can be set to the symbol `set-from-style'. In that case,
it takes its value from the style system (see `c-default-style' and
`c-style-alist') when a CC Mode buffer is initialized. Otherwise,
the value set here overrides the style system (there is a variable
`c-old-style-variable-behavior' that changes this, though).

You can customize this variable.