Backport commit 78eacf31e from Emacs

; Fix many typos in symbols in docs and comments
78eacf31e8fe182801ad1943fac717b75fcf286b
Stefan Kangas
Fri Oct 2 13:29:45 2020 +0200

lisp/ol-bibtex.el

@@ -317,7 +317,7 @@ is non-nil."
   "Controls whether inherited tags are converted to bibtex keywords.
 It is relevant only if `org-bibtex-tags-are-keywords' is non-nil.
 Tag inheritance itself is controlled by `org-use-tag-inheritance'
-and `org-exclude-tags-from-inheritance'."
+and `org-tags-exclude-from-inheritance'."
   :group 'org-bibtex
   :version "26.1"
   :package-version '(Org . "8.3")

lisp/org-num.el

@@ -131,7 +131,7 @@ For example, add \"ARCHIVE\" to this list to avoid numbering
 archived sub-trees.
 
 Tag in this list prevent numbering the whole sub-tree,
-irrespective to `org-use-tags-inheritance', or other means to
+irrespective to `org-use-tag-inheritance', or other means to
 control tag inheritance."
   :group 'org-appearance
   :package-version '(Org . "9.3")

lisp/org.el

@@ -1933,7 +1933,7 @@ taken from the (otherwise obsolete) variable `org-todo-interpretation'."
 		   (choice
 		    :tag "Interpretation"
 		    ;;Quick and dirty way to see
-		    ;;`org-todo-interpretations'.  This takes the
+                    ;;`org-todo-interpretation'.  This takes the
 		    ;;place of item arguments
 		    :convert-widget
 		    (lambda (widget)