fix filex api services index

Author: ayedm1

rtos-docs/filex/chapter4.md

@@ -34,7 +34,8 @@ The FileX API functions available to the application are as follows.
 - [fx_file_attributes_read](#fx_file_attributes_read)
 - [fx_file_attributes_set](#fx_file_attributes_set)
 - [fx_file_best_effort_allocate](#fx_file_best_effort_allocate)
-- [fx_file_close_fx_file_create](#fx_file_close_fx_file_create)
+- [fx_file_close](#fx_file_close)
+- [fx_file_create](#fx_file_create)
 - [fx_file_date_time_set](#fx_file_date_time_set)
 - [fx_file_delete](#fx_file_delete)
 - [fx_file_extended_allocate](#fx_file_extended_allocate)
@@ -43,9 +44,11 @@ The FileX API functions available to the application are as follows.
 - [fx_file_extended_seek](#fx_file_extended_seek)
 - [fx_file_extended_truncate](#fx_file_extended_truncate)
 - [fx_file_extended_truncate_release](#fx_file_extended_truncate_release)
-- [fx_file_open_fx_file_read](#fx_file_open_fx_file_read)
+- [fx_file_open](#fx_file_open)
+- [fx_file_read](#fx_file_read)
 - [fx_file_relative_seek](#fx_file_relative_seek)
-- [fx_file_rename_fx_file_seek](#fx_file_rename_fx_file_seek)
+- [fx_file_rename](#fx_file_rename)
+- [fx_file_seek](#fx_file_seek)
 - [fx_file_truncate](#fx_file_truncate)
 - [fx_file_truncate_release](#fx_file_truncate_release)
 - [fx_file_write](#fx_file_write)