Meta and Alt confusion in the manual

[Lennart Borgman]

In "(emacs) Symbol Completion" (31.8):

      The character `M-<TAB>' runs a command to complete the partial
   symbol before point against the set of meaningful symbol names.  This
   command inserts at point any additional characters that it can
   determine from the partial name.  (If your window manager defines
   `M-<TAB>' to switch windows, you can type `<ESC> <TAB>' or `C-M-i'.)

The window manager of course does not use M-<TAB>. It uses Alt-<TAB>. 
Meta is Emacs specific and could be on another keyboard key than Alt.

I think this should be corrected to avoid confusion.