SecurityPkg: Fix typos in comments

This patch fixes the following typos:
- intialized -> initialized
- TURE -> TRUE
- successull -> successfully
- hanlder -> handler
- funciton -> function
- Seperator -> Separator
- Sumbit -> Submit
Also convert EFI_D_ERROR to DEBUG_ERROR for some debug messages.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>

SecurityPkg/Library/DxeRsa2048Sha256GuidedSectionExtractLib/DxeRsa2048Sha256GuidedSectionExtractLib.c

@@ -59,7 +59,7 @@ CONST UINT8 mRsaE[] = { 0x01, 0x00, 0x01 };
   @param SectionAttribute   The attribute of the input guided section.
 
   @retval EFI_SUCCESS            The size of destination buffer, the size of scratch buffer and 
-                                 the attribute of the input section are successull retrieved.
+                                 the attribute of the input section are successfully retrieved.
   @retval EFI_INVALID_PARAMETER  The GUID in InputSection does not match this instance guid.
 
 **/