[docs] Add some missing API to harfbuzz-sections.txt

docs/harfbuzz-sections.txt

diff --git a/docs/harfbuzz-sections.txt b/docs/harfbuzz-sections.txt
index 32f794b..535cd6c 100644
--- a/docs/harfbuzz-sections.txt
+++ b/docs/harfbuzz-sections.txt
@@ -359,6 +359,8 @@
 hb_font_get_font_v_extents_func_t
 hb_font_get_h_extents
 hb_font_get_v_extents
+hb_font_extents_t
+hb_glyph_extents_t
 </SECTION>
 
 <SECTION>