Change Text Alignment & Fix Some Typos

* Replaced text justification with left-align (raggedright) for all text
  in dev docs.

    * Removed previous manual left-align in RPC byte order table

* Changed placement of See Below text partly based on a suggestion by
  @saivann (thanks!)

* Normalized capitialization of special structures (e.g. s/TxIn/txIn/)
  to be consistent with some other parts of the docs. (I don't think
  we're fully consistent on this in all parts of the docs. I'll put a
  rule in the style guide today and then we can make changes on the next
  global proofread.)

* Fixed missing period found by @saivann (thanks!) and a related missing
  preposition.