ticdc: clarify that you don't escape the whole URL but just the parameters

[kennytm]

What is changed, added or deleted? (Required)

Clarify the wording on what needs to be URI-Encoded.

Some customer reading this note thought they need to pass the Sink URI like this:

--sink-uri='mysql%3A%2F%2Froot%3ATidb%40123456%40127.0.0.1%3A3306%2F'

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• [x] master (the latest development version)
• [x] v8.1 (TiDB 8.1 versions)
• [x] v8.0 (TiDB 8.0 versions)
• [x] v7.6 (TiDB 7.6 versions)
• [x] v7.5 (TiDB 7.5 versions)
• [x] v7.4 (TiDB 7.4 versions)
• [x] v7.1 (TiDB 7.1 versions)
• [x] v6.5 (TiDB 6.5 versions)
• [x] v6.1 (TiDB 6.1 versions)
• [x] v5.4 (TiDB 5.4 versions)
• [x] v5.3 (TiDB 5.3 versions)
• [x] v5.2 (TiDB 5.2 versions)
• [x] v5.1 (TiDB 5.1 versions)

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Do your changes match any of the following descriptions?

• [ ] Delete files
• [ ] Change aliases
• [ ] Need modification after applied to another branch
• [ ] Might cause conflicts after applied to another branch

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[kennytm]

/cc @chenmin1992

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[ti-chi-bot[bot]]

PR needs rebase.

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