Documentation look up

slime-tips:

C-c C-d h  looks up documentation in CLHS. But it works only on symbols, so there are two more bindings:
C-c C-d #  for reader macros
C-c C-d ~  for format directives

Other bindings which may be useful:
C-c C-d d  describes a symbol using DESCRIBE
C-c C-d f  describes a function using DESCRIBE