Mark make_default_short_help as private API

Refs: #3189 (comment)

Author: kdeldycke

CHANGES.rst

@@ -13,6 +13,7 @@ Unreleased
     ``semver.Version``. :issue:`3298` :pr:`3299`
 -   Fix pager test pollution under parallel execution by using pytest's
     ``tmp_path`` fixture instead of a shared temporary file path. :pr:`3238`
+-   Mark ``make_default_short_help`` as private API. :issue:`3189` :pr:`3250`
 
 Version 8.3.2
 -------------

src/click/utils.py

@@ -57,7 +57,10 @@ def make_str(value: t.Any) -> str:
 
 
 def make_default_short_help(help: str, max_length: int = 45) -> str:
-    """Returns a condensed version of help string."""
+    """Returns a condensed version of help string.
+
+    :meta private:
+    """
     # Consider only the first paragraph.
     paragraph_end = help.find("\n\n")