docs: fix many documentation issues in gobject/

docs/reference/gobject/Makefile.am

@@ -25,10 +25,9 @@ CFILE_GLOB=$(top_srcdir)/gobject/*.c
 # Headers to ignore
 IGNORE_HFILES = \
 	tests			\
+	gatomicarray.h		\
 	gobject_trace.h		\
-	gtype-private.h		\
-	gatomicarray.h
-
+	gtype-private.h
 
 # CFLAGS and LDFLAGS for compiling scan program. Only needed
 # if $(DOC_MODULE).types is non-empty.

docs/reference/gobject/gobject-sections.txt

@@ -425,6 +425,10 @@ g_source_get_type
 g_pollfd_get_type
 g_bytes_get_type
 g_key_file_get_type
+g_checksum_get_type
+g_mapped_file_get_type
+g_markup_parse_context_get_type
+g_thread_get_type
 </SECTION>
 
 <SECTION>
@@ -492,7 +496,6 @@ G_PARAM_SPEC_VALUE_TYPE
 GParamSpec
 GParamSpecClass
 GParamFlags
-G_PARAM_READWRITE
 G_PARAM_STATIC_STRINGS
 G_PARAM_MASK
 G_PARAM_USER_SHIFT