docs: standardize env vars to uppercase convention #8756
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Description
Standardizes all environment variable references in documentation to use uppercase naming convention (NPM_CONFIG_) instead of lowercase (npm_config_).
Changes
Fixes
Closes #4891
Rationale
The documentation had inconsistent casing for environment variables - some references used uppercase (NPM_CONFIG_USERCONFIG) while others used lowercase (npm_config_prefix). Following the standard convention, environment variables should always be referenced in uppercase. While npm internally converts both to lowercase, using uppercase in documentation follows the de-facto standard and avoids confusion.
Type of Change
Documentation update