Fix connector examples links in central to point to the correct branch in source repo

[NipunaRanasinghe]

Description

Currently all the connector examples listed under the connector API docs (in the central) are pointed to the master/main branch of the source repository (e.g. https://central.ballerina.io/ballerinax/salesforce/8.1.0#examples)

This approach could lead to issues when breaking changes are introduced in the master branch that are not yet reflected in the stable release. Users might follow outdated or incompatible examples, resulting in confusion or errors when trying to run the examples.

To address this, it would be more effective to link the examples to a specific release tag or version in the source repository.

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