Fix: color codes in learn/netwrok section

[vizipi[bot]]

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%	AelfHarsh	2	1
100.00%	yongenaelf	1	1

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Potential missing files from this Pull request

files commonly committed with a subset of this pr, but not committed this time. (click to collapse)

File	Percentile	rate
...docs/quick-start/develop-your-first-aelf-smart-contract/i	71.43%	5 out of 7 times
docs/docs/smart-contract-api/consensus-contract/index.md	71.43%	5 out of 7 times
docs/docs/smart-contract-api/parliament-contract/index.md	71.43%	5 out of 7 times
docs/learn/aelf-blockchain-boot-sequence/index.md	71.43%	5 out of 7 times
...docs/docs/smart-contract-api/configuration-contract/index	71.43%	5 out of 7 times
docs/docs/smart-contract-api/genesis-contract/index.md	71.43%	5 out of 7 times
docs/docs/smart-contract-api/association-contract/index.md	71.43%	5 out of 7 times
docs/docs/smart-contract-api/referendum-contract/index.md	71.43%	5 out of 7 times
...docs/docs/smart-contract-api/token-convert-contract/index	71.43%	5 out of 7 times
docs/learn/core/introduction/index.md	71.43%	5 out of 7 times

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Committed file ranks

(click to expand)

71.46%[docs/learn/network/index.md]

[AelfHongliang]

Source code review has been completed taking reference from the Quality and Secure Coding Guidelines.