Fixed typos and grammatical errors.

[jamaltheatlantean]

Removed the extra L in below, line 29. Added 'can be' in line 42. Deleted the e in similar, line 70.

[vizipi]

Pull request analysis by VIZIPI

Below you will find who is the most qualified team member to review your code.
This analysis includes his/her work on the code included in this Pull request, in addition to their experience in code affected by these changes ( partly found within the list of potential missing files below )   Feedback always welcome

Reviewers with knowledge related to these changes

Match %	Person	Commit Count	Common Files
100.00 %	loning	16	1
100.00 %	EanCuznaivy	4	1
100.00 %	weili	2	1
100.00 %	jason-hoopox	1	1

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Potential missing files from this Pull request

No commonly committed files found with a 40% threashold

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Committed file ranks

(click to expand)

98.00%[README.md]

[codecov]

Codecov Report

Merging #3345 (15d90fb) into dev (46a4c5d) will decrease coverage by 19.08%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##              dev    #3345       +/-   ##
===========================================
- Coverage   91.11%   72.03%   -19.09%     
===========================================
  Files         618      558       -60     
  Lines       23243    21692     -1551     
  Branches     2034     1915      -119     
===========================================
- Hits        21178    15625     -5553     
- Misses       1858     5558     +3700     
- Partials      207      509      +302     

Impacted Files	Coverage Δ
src/AElf.Kernel.Types/Chain/Chain.cs	0.00% <0.00%> (-100.00%)	⬇️
src/AElf.Kernel.Types/KernelConstants.cs	0.00% <0.00%> (-100.00%)	⬇️
src/AElf.CrossChain/CrossChainAElfModule.cs	0.00% <0.00%> (-100.00%)	⬇️
src/AElf.OS.Core/Network/Application/Response.cs	0.00% <0.00%> (-100.00%)	⬇️
src/AElf.Kernel/InitialSyncFinishedEventHandler.cs	0.00% <0.00%> (-100.00%)	⬇️
...c/AElf.CrossChain/Application/CrossChainService.cs	0.00% <0.00%> (-100.00%)	⬇️
.../AElf.Kernel.SmartContract/StateProviderFactory.cs	0.00% <0.00%> (-100.00%)	⬇️
.../AElf.Kernel/ConsensusRequestMiningEventHandler.cs	0.00% <0.00%> (-100.00%)	⬇️
...AElf.OS.Core/Network/Application/NetworkService.cs	0.00% <0.00%> (-100.00%)	⬇️
....Cryptography/Exceptions/EcdhOperationException.cs	0.00% <0.00%> (-100.00%)	⬇️
... and 307 more