docs: update dynamic content example to use onTypingDone (#125)

[geekyanimesh]

This PR updates the "Dynamic content usage" section in README.md to use the onTypingDone method
for cycling through an array of text values, as suggested in issue #125.

Changes:

• Replaced click-to-change example with auto-cycle example using onTypingDone
• Matches behavior requested by community and improves real-world usability

[geekyanimesh]

Hi @jstejada,
This PR updates the Dynamic content usage example in README.md to use onTypingDone for automatic text cycling, as discussed in #125.

Improves usability by removing the need for manual clicks.

Matches the behavior requested by the community.

It’s merge-ready with no conflicts. Would appreciate your review when you get a chance.

Thanks for maintaining this project!