Add face-builder

New API:
+hb_face_builder_create
+hb_face_builder_add_table

docs/harfbuzz-sections.txt

diff --git a/docs/harfbuzz-sections.txt b/docs/harfbuzz-sections.txt
index 16b6627..f98e8cc 100644
--- a/docs/harfbuzz-sections.txt
+++ b/docs/harfbuzz-sections.txt
@@ -170,6 +170,7 @@
 <SECTION>
 <FILE>hb-face</FILE>
 hb_face_count
+hb_face_t
 hb_face_create
 hb_face_create_for_tables
 hb_face_destroy
@@ -188,7 +189,8 @@
 hb_face_set_index
 hb_face_set_upem
 hb_face_set_user_data
-hb_face_t
+hb_face_builder_create
+hb_face_builder_add_table
 </SECTION>
 
 <SECTION>
@@ -226,6 +228,7 @@
 hb_font_get_glyph_advance_for_direction
 hb_font_get_glyph_advance_func_t
 hb_font_get_glyph_advances_for_direction
+hb_font_get_glyph_advances_func_t
 hb_font_get_glyph_contour_point
 hb_font_get_glyph_contour_point_for_origin
 hb_font_get_glyph_contour_point_func_t