- Specification was a level-3 heading and therefore rendered as a
subsection of Motivation; Backward Compatibility, Implementation and
Related Work were one level too deep as well.
- Drop the stray '<' in front of the testnet address tb1pfees9rn5nz.
- 'typea' -> 'type', 'ineherent' -> 'inherent'.
- Add the Copyright section required by BIP 3, matching the
BSD-3-Clause License header.
```
sed -z -i 's/Author: /Authors: /' bip-0*.md
sed -z -i 's/Author: /Authors: /' bip-0*.mediawiki
```
Also align correctly in case of multiple authors.
Also line up with additional items in the lines below.
```
sed -i -z 's/ Post-History: / Discussion: /' bip-0*.md
sed -i -z 's/ Post-History: / Discussion: /' bip-0*.mediawiki
```
