Fix: meesed up minor modes

Because at-point mode uses hover mode, disabling each other
doesn't work.

README.org

@@ -13,6 +13,8 @@ Get the file, add to load path, and
 ** Function
 Enable either mode will make eldoc display documentation on a popup childframe. The difference is the position of the childframe — the first minor mode displays the childframe on the (left or right) upper corner, while the second displays the childframe right below point.
 
+Note that =eldoc-box-hover-at-point-mode= enables =eldoc-box-hover-mode= — it just adds some more configuration on top of the latter, so you want to disable “at-point” mode before switching to =eldoc-box-hover-mode=.
+
 - =eldoc-box-hover-mode= :: Display documentation of the symbol at point in a childframe on upper corner.
 - =eldoc-box-hover-at-point-mode= :: Display documentation of the symbol at point in a childframe below point. (That's what the =at-point= part mean)
 ** Face

eldoc-box.el

@@ -127,8 +127,7 @@ It will be passes with two arguments: WIDTH and HEIGHT of the childframe.")
   "Displays hover documentations in a childframe. This mode is buffer local."
   :lighter " ELDOC-BOX"
   (if eldoc-box-hover-mode
-      (progn (eldoc-box-hover-at-point-mode -1)
-             (add-function :before-until (local 'eldoc-message-function)
+      (progn (add-function :before-until (local 'eldoc-message-function)
                            #'eldoc-box--eldoc-message-function)
              (when eldoc-box-clear-with-C-g
                (advice-add #'keyboard-quit :before #'eldoc-box-quit-frame)))
@@ -146,8 +145,7 @@ It will be passes with two arguments: WIDTH and HEIGHT of the childframe.")
 You can use C-g to hide the doc."
   :lighter ""
   (if eldoc-box-hover-at-point-mode
-      (progn (eldoc-box-hover-mode -1)
-             (setq-local
+      (progn (setq-local
               eldoc-box-position-function
               #'eldoc-box--default-at-point-position-function)
              (setq-local eldoc-box-clear-with-C-g t)