Inconsistency in standalone signature definitions

[Andrew Gallagher]

There appears to be an inconsistency in the librepgp spec regarding standalone signatures.

Section 5.2.1 (Signature Types) states:

```
0x02 Standalone signature. ... It is calculated identically to a signature over a zero-length binary document.
```

But then Section 5.2.4 (Computing Signatures) states:

```
A V5 signature hashes…
…
Only for document signatures (type 0x00 or 0x01) the following three data items are hashed here:
```

Read alone, this implies that a V5 type 0x02 signature is *not* the same as a V5 type 0x00 signature over a zero-length file.

However immediately afterward it then clarifies:

```
Note that for a detached signatures this means to hash 6 0x00 octets
```

It would be more consistent (and less confusing) to update the second text snippet above to read:

```
Only for document signatures (type 0x00, 0x01 or 0x02) the following three data items are hashed here:
```

Since the three extra fields (albeit with constant zero values) are included in the hash for V5 0x02 sigs.

A

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