document follow+nodir

Author: isaacs

README.md

@@ -509,6 +509,9 @@ share the previously loaded cache.
 - `nodir` Do not match directories, only files. (Note: to match
   _only_ directories, put a `/` at the end of the pattern.)
 
+  Note: when `follow` and `nodir` are both set, then symbolic
+  links to directories are also omitted.
+
 - `stat` Call `lstat()` on all entries, whether required or not
   to determine whether it's a valid match. When used with
   `withFileTypes`, this means that matches will include data such
@@ -539,6 +542,9 @@ share the previously loaded cache.
   it is not the first item in the pattern, or none if it is the
   first item in the pattern, following the same behavior as Bash.
 
+  Note: when `follow` and `nodir` are both set, then symbolic
+  links to directories are also omitted.
+
 - `realpath` Set to true to call `fs.realpath` on all of the
   results. In the case of an entry that cannot be resolved, the
   entry is omitted. This incurs a slight performance penalty, of