Fix spelling nits

Change-Id: Ie64ed383a1f6b63a0624c8a6f64d92a33dabf56e
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/61485
Auto-Submit: Bob Beck <bbe@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

include/openssl/asm_base.h

@@ -34,7 +34,7 @@
 // - The file, on aarch64, uses the macros defined below to be compatible with
 //   BTI and PAC.
 //
-// - The file, on X86_64, requires the progrram to be compatible with Intel IBT
+// - The file, on x86_64, requires the program to be compatible with Intel IBT
 //   and SHSTK
 
 #if defined(__ASSEMBLER__)