efi_loader: documentation codepage_437[]

Variables cannot be documented via kernel-doc. Avoid 'make htmldocs' build
warning

    ./include/charset.h:19: warning:
    cannot understand function prototype: 'const u16 codepage_437[128]; '

Fixes: 70616a1ed8c7 ("efi_loader: move codepage 437 table")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/charset.h b/include/charset.h
index a911160..b93d023 100644
--- a/include/charset.h
+++ b/include/charset.h
@@ -13,7 +13,7 @@
 
 #define MAX_UTF8_PER_UTF16 3
 
-/**
+/*
  * codepage_437 - Unicode to codepage 437 translation table
  */
 extern const u16 codepage_437[128];