Check spelling of word under or before the cursor.
If the word is not found in dictionary, display possible corrections
in a window allowing you to choose one.
If optional argument FOLLOWING is non-nil or if `ispell-following-word'
is non-nil when called interactively, then the following word
(rather than preceding) is checked when the cursor is not over a word.
When the optional argument QUIETLY is non-nil or `ispell-quietly' is non-nil
when called interactively, non-corrective messages are suppressed.
With a prefix argument (or if CONTINUE is non-nil),
resume interrupted spell-checking of a buffer or region.
Interactively, in Transient Mark mode when the mark is active, call
`ispell-region' to check the active region for spelling errors.
Word syntax is controlled by the definition of the chosen dictionary,
which is in `ispell-local-dictionary-alist' or `ispell-dictionary-alist'.
This will check or reload the dictionary. Use M-x ispell-change-dictionary
or M-x ispell-region to update the Ispell process.
nil word is correct or spelling is accepted.
0 word is inserted into buffer-local definitions.
"word" word corrected from word list.
("word" arg) word is hand entered. quit spell session exited. (fn &optional FOLLOWING QUIETLY CONTINUE REGION)