[docs]: Fix documentation for File Picker Component

[vrushabhgawas14]

Description Updated file-picker docs as mentioned in issue #10976

• [X] Formatting updates (fixed fx, removed padding bottom, added separator)
• [X] Content updates (replaced widget to component, updated Description of Event table)
• [X] Didn't change any existing link

This PR solves #10976

Files on which changes are implemented - Next - ToolJet/docs/docs/widgets/file-picker.md Version 2.50.0 (LTS) - ToolJet/docs/versioned_docs/version-2.50.0-LTS/widgets/file-picker.md

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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

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