[doc] Add experimental repacker API to private section
Hides the warning about them until they are no longer experimental.
diff --git a/docs/harfbuzz-sections.txt b/docs/harfbuzz-sections.txt
index ed52b69..6f0da72 100644
--- a/docs/harfbuzz-sections.txt
+++ b/docs/harfbuzz-sections.txt
@@ -767,6 +767,7 @@
hb_subset_input_unicode_set
hb_subset_input_glyph_set
hb_subset_input_set
+hb_subset_or_fail
hb_subset_plan_create_or_fail
hb_subset_plan_reference
hb_subset_plan_destroy
@@ -776,5 +777,8 @@
hb_subset_plan_unicode_to_old_glyph_mapping
hb_subset_plan_new_to_old_glyph_mapping
hb_subset_plan_old_to_new_glyph_mapping
-hb_subset_or_fail
+<SUBSECTION Private>
+hb_link_t
+hb_object_t
+hb_subset_repack_or_fail
</SECTION>
