Fix misaligned index numbers (#111)

Author: baek9

index.bs

@@ -404,7 +404,7 @@ spec: SHA2; urlPrefix: http://csrc.nist.gov/publications/fips/fips180-4/fips-180
           </a>.
       4.  If |actualValue| is a case-sensitive match for
           |expectedValue|, return `true`.
-  7.  Return `false`.
+  6.  Return `false`.
 
   This algorithm allows the user agent to accept multiple, valid strong hash
   functions. For example, a developer might write a `script` element such as: