ff720780950e010cb13af7def1d2226841ca3f97 Document return type of `sign` method. (Thibaut Le Guilly)
Pull request description:
Small thing but I had to look up the code to see what the returned boolean was about, thought it might be good to have in the docs.
### Description
Documents the meaning of the returned value on the wallet `sign` method.
I've just edited from github so skipped all the checks if that's not ok maybe someone else can update it properly.
ACKs for top commit:
w0xlt:
ACK ff72078095
notmandatory:
ACK ff720780950e010cb13af7def1d2226841ca3f97
Tree-SHA512: e0dd52a0af663b88d3fe0a20cb2909b9ba00bcf4f224b4f87cfd53fee0a199a01679dc5cd74aeb440326dfc52d45fa887534138d25df6fa1c8a38678be23204e