Update max line indicator docs, clarification

Make it clear that "line" and "fill" highlight all lines, whereas "exceeding"
and "fillexceeding" only highlight lines that exceed max line length.

Also, correct description of "none" value, which was no longer accurate as it
referred to any value other than "line" or "fill" having equivalent behaviour.

Author: mmrwoods

doc/editorconfig.txt

@@ -128,12 +128,12 @@ are "line", "fill", "exceeding" and "fillexceeding", otherwise there will be
 no max line indicator.
 
     "line":          the right column of the max line length column will be
-                     highlighted, by adding "+1" to 'colorcolumn'.
+                     highlighted on all lines, by adding +1 to 'colorcolumn'.
 
     "fill":          all the columns to the right of the max line length
-                     column will be highlighted, by setting 'colorcolumn' to
-                     a list of numbers starting from "max_line_length + 1" to
-                     the number of columns on the screen.
+                     column will be highlighted on all lines, by setting
+                     'colorcolumn' to a list starting from "max_line_length +
+                     1" to the number of columns on the screen.
 
     "exceeding":     the right column of the max line length column will be
                      highlighted on lines that exceed the max line length, by
@@ -143,10 +143,9 @@ no max line indicator.
                      column will be highlighted on lines that exceed the max
                      line length, by adding a match for the ColorColumn group.
 
-    "none":          no max line length indicator will be shown. This is the
-                     recommended value when you do not want any indicator to
-                     be shown, but values other than "line" or "fill" would
-                     also work as "none".
+    "none":          no max line length indicator will be shown. Recommended
+                     when you do not want any indicator to be shown, but any
+                     value other than those listed above also work as "none".
 
 To set this option, add any of the following lines to your |vimrc| file:
 >