update doc

core/iwasm/aot/aot_loader.c

@@ -3343,6 +3343,6 @@ aot_get_custom_section(AOTModule *module, const char *name, uint32 *len)
         section = section->next;
     }
 
-    return false;
+    return NULL;
 }
 #endif /* end of WASM_ENABLE_LOAD_CUSTOM_SECTION */

core/iwasm/compilation/aot_emit_aot_file.c

@@ -1304,7 +1304,7 @@ get_custom_sections_size(AOTCompContext *comp_ctx, AOTCompData *comp_data)
         size = align_uint(size, 4);
         /* section id + section size + sub section id */
         size += (uint32)sizeof(uint32) * 3;
-        /* section name, null terminated string */
+        /* section name and len */
         size += get_string_size(comp_ctx, section_name);
         /* section content */
         size += length;

core/iwasm/include/wasm_export.h

@@ -1060,7 +1060,8 @@ wasm_runtime_dump_call_stack(wasm_exec_env_t exec_env);
  * @param name name of the custom section
  * @param len return the length of the content if found
  *
- * @return Custom section content (including the name) if found, NULL otherwise
+ * @return Custom section content (not including the name length
+ *         and name string) if found, NULL otherwise
  */
 WASM_RUNTIME_API_EXTERN const uint8_t *
 wasm_runtime_get_custom_section(wasm_module_t const module_comm,