Perhaps someone will answer that there's a 3rd-party package that helps with what you ask: interact with the Common Lisp doc using some
C-h key(s). I'm not aware of any (but you can use
eww to browse Common Lisp documentation on the web).
However, Emacs comes with library
cl-lib.el, which provides Elisp functions etc. that to some extent emulate Common Lisp ones. The Elisp ones generally use the Common Lisp name but with prefix
cl-. And Emacs provides a manual for this feature, GNU Emacs Common Lisp Emulation.
Unfortunately, the documentation of each
cl- function etc. is very limited. Essentially, it typically just says that it emulates the Common Lisp function etc. So you often can't get much of a description.
And some Common Lisp functions etc. are not emulated. There is no
cl-format function, for example - no emulation of Common Lisp