docs: replace CitaTransactionManager with TransactionManager of document

[duanyytop]

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[codecov-io]

Codecov Report

Merging #118 into develop will decrease coverage by 0.15%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             develop    #118      +/-   ##
============================================
- Coverage      22.36%   22.2%   -0.16%     
  Complexity       898     898              
============================================
  Files            196     196              
  Lines          12057   12141      +84     
  Branches        1674    1692      +18     
============================================
  Hits            2696    2696              
- Misses          9118    9202      +84     
  Partials         243     243

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/cryptape/cita/utils/TransactionUtil.java	9.85% <0%> (-0.75%)	1% <0%> (ø)
...va/com/cryptape/cita/protocol/account/Account.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...ita/protocol/core/methods/request/Transaction.java	0% <0%> (ø)	0% <0%> (ø)	⬇️

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