Fix up strict discussion

core/cap-0052.md

@@ -69,9 +69,13 @@ Parameter `padding` specifies the padding character with the same limitations on
 valid values as specified in [RFC4648]. The padding character is 8-bit, and is
 stored in the lower 8-bits of the U32Val type. If the padding value of
 0xffffffff is used it indicates no padding is to be used when encoding, and no
-padding is required when decoding, but padding is permitted. If the padding
-value of 0xfffffffe is used it indicates decoding should fail if the trailing
-padding bits are not zero.
+padding is required when decoding, but padding is permitted, unless strict is
+specified.
+
+Parameter `strict` specifies for decoding whether incomplete, non-existent, or
+present-when-unspected padding should be considered an error. If strict is
+specified then any padding that doesn't exactly match the padding that's
+required would cause an error.
 
 ```diff mddiffcheck.ignore=true mddiffcheck.base=v20.1.0
 --- a/soroban-env-common/env.json