get transaction documentation updates

See merge request !134

Add PHP tutorials

See merge request !132

Add more vops with hex representation to list in account history API docs

See merge request !131

#78 example consistency

See merge request !128

HF26 Changes

See merge request !125

added exception scenario where we have documented definitions but the requested signature returns empty ones

Change verify_signatures description in database_api documentation

See merge request !121

Hive documentation fixes

See merge request !119

Example had unsupported order type (by_effective_date)

List of deleted method descriptions:
- find_smt_contributions
- find_smt_token_emissions
- find_smt_tokens
- list_smt_contributions
- list_smt_token_emissions
- list_smt_tokens

#73 dropped old node, added active one

See merge request !115

#90 fixed url

See merge request !120

#90 fixed url

See merge request !119

Merging Arctic Eyes Sprint

See merge request !118