Add changes to integrations guide

[javimed]

Description

This PR adds some changes to the integrations guide and the following fixes to the Splunk integration section:

• Add missing quotation marks in Splunk certificate path example
• Remove unnecessary parameters in keystore password saving
• Remove search-bar-in-progress dashboard reference
• Add clarification to step 4 in dashboards importing steps

Checks

Docs building

• Compiles without warnings.

Code formatting and web optimization

• Uses three spaces indentation.
• Adds or updates meta descriptions accordingly.
• Updates the redirects.js script if necessary (check this guide).

Writing style

• Uses present tense, active voice, and semi-formal registry.
• Uses short, simple sentences.
• Uses bold for user interface elements, italics for key terms or emphasis, and code font for Bash commands, file names, REST paths, and code.