unify PROVIDER var in examples on the debug-callback page

[kubenstein]

Description

Unify PROVIDER bash variable name across example code snippets on /entropy/debug-callback-failures page.

One code snippet uses PROVIDER_ADDRESS bash variable instead of PROVIDER which is defined earlier on the page.

Let's unify those variables for better copy-pastability.

Type of Change

• New Page
• Page update/improvement
• Fix typo/grammar
• Restructure/reorganize content
• Update links/references
• Other (please describe):

Areas Affected

• /entropy/debug-callback-failures

Checklist

• I ran pre-commit run --all-files to check for linting errors
• I have reviewed my changes for clarity and accuracy
• All links are valid and working
• Images (if any) are properly formatted and include alt text
• Code examples (if any) are complete and functional
• Content follows the established style guide
• Changes are properly formatted in Markdown
• Preview renders correctly in development environment

Contributor Information

• Name: Jakub Niewczas
• Email: niewczas.jakub@gmail.com

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