fix: return types, dependencies and documentation link

[repat]

Summary

• Link to documentation redirected to the main documentation site, I changed it so it opens the PHP-Client documentation directly.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

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[codecov]

Codecov Report

Merging #95 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master      #95   +/-   ##
=========================================
  Coverage     90.84%   90.84%           
- Complexity       66      114   +48     
=========================================
  Files            14       14           
  Lines           142      142           
=========================================
  Hits            129      129           
  Misses           13       13           

Impacted Files	Coverage Δ	Complexity Δ
src/API/AbstractAPI.php	0.00% <ø> (ø)	3.00 <0.00> (ø)
src/API/Blocks.php	100.00% <100.00%> (ø)	12.00 <12.00> (+6.00)
src/API/Bridgechains.php	100.00% <100.00%> (ø)	6.00 <6.00> (+3.00)
src/API/Businesses.php	100.00% <100.00%> (ø)	8.00 <8.00> (+4.00)
src/API/Delegates.php	100.00% <100.00%> (ø)	8.00 <8.00> (+4.00)
src/API/Locks.php	100.00% <100.00%> (ø)	8.00 <8.00> (+4.00)
src/API/Node.php	100.00% <100.00%> (ø)	10.00 <10.00> (+5.00)
src/API/Peers.php	100.00% <100.00%> (ø)	4.00 <4.00> (+2.00)
src/API/Rounds.php	100.00% <100.00%> (ø)	2.00 <2.00> (+1.00)
src/API/Transactions.php	100.00% <100.00%> (ø)	16.00 <16.00> (+8.00)
... and 3 more

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