Typo in BBE

[sm1990]

Description

The heading should be Interface to external code in https://ballerina.io/learn/by-example/interface-to-external-code/.

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Affected version(s)

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Related website/documentation area

Add/Uncomment the relevant area label out of the following.

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[sm1990]

Closing as this is a duplicate of #8798

[github-actions]

This issue is NOT closed with a proper Reason/ label. Make sure to add proper reason label before closing. Please add or leave a comment with the proper reason label now.

      - Reason/EngineeringMistake - The issue occurred due to a mistake made in the past.
      - Reason/Regression - The issue has introduced a regression.
      - Reason/MultipleComponentInteraction - Issue occured due to interactions in multiple components.
      - Reason/Complex - Issue occurred due to complex scenario.
      - Reason/Invalid - Issue is invalid.
      - Reason/Other - None of the above cases.