Add string template splitting section

[poorna2152]

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Closes #ballerina-platform/ballerina-dev-website#9061

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[gimantha]

Seems the string is not split into a new line

[gimantha]

ignore the comment please.

[gimantha]

On a second thought, I feel having newline also in a middle of the string template and showing the output is also worth, as it is useful for examples like email content. may not be related to the 120 character formatting issue

[poorna2152]

The string s2 here, https://ballerina.io/learn/by-example/backtick-templates/. Isn't it kind of similar to using special characters like new line in a string template.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud