compile-goto-error Help addition

[Dan Jacobson]

The *Help* info for compile-goto-error needs to mention more:

|RET runs the command compile-goto-error
|   which is an interactive compiled Lisp function in `compile'.
|(compile-goto-error &optional ARGP)
|
|Visit the source for the error message point is on.
Visit the source file for the error message point is on and put the
cursor on that line [and character? e.g. ":676:42:" line 676, position
42, does emacs have this capability? HTML tidy -e [for emacs] can make
this type of output].

If the cursor is on a line between errors, operate on the next error.
|Use this command in a compilation log buffer.  Sets the mark at point there.
|C-u as a prefix arg means to reparse the buffer's error messages first;
|other kinds of prefix arguments are ignored.

[Info also needs this added.]
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