10b4b6c665Documentations regarding absolute_fee and fee_rate updated (TATHAGATA ROY) Pull request description: ### Description This pr solves this issue #856 Updated the documentation for absolute fee and fee rate in BDK docs #### All Submissions: * [x] I've signed all my commits * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md) #### Bugfixes: * [x] I'm linking the issue being fixed by this PR ACKs for top commit: danielabrozzoni: ACK10b4b6c665Tree-SHA512: 5b5f360b742313443368dc0b75275c38888cb358545661f7d9c78f3290789c50ffa9830e18473055d8e3da544c7d9527b023a1acdb28eaf862b24c892b23e9c4