Update documentation for password

[ritalwar]

• Enhancement

What does this PR do?

This PR updates the Readme.md to specify URL encoding for passwords with special character.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

• Relates 4198

Screenshots

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• Start Time: 2023-02-13T05:11:07.450+0000

• Duration: 15 min 15 sec

Test stats 🧪

Test	Results
Failed	0
Passed	19
Skipped	0
Total	19

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚 3.443
Classes	100.0% (2/2)	💚 3.443
Methods	93.333% (28/30)	👍 2.341
Lines	100.0% (1238/1238)	💚 8.617
Conditionals	100.0% (0/0)	💚

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Package microsoft_sqlserver - 1.13.0 containing this change is available at https://epr.elastic.co/search?package=microsoft_sqlserver