Fix grammar and documentation issues

[KingSajxxd]

• Fix 'a out-of-the-box' → 'an out-of-the-box'
• Fix 'a API document' → 'an API document'
• Fix 'When a API' → 'When an API' (2 instances)
• Fix 'create a API Policy' → 'create an API Policy'
• Fix 'Provide a API Manager' → 'Provide an API Manager' (2 instances)
• Fix 'Subscribe to a application' → 'Subscribe to an application'
• Fix image path typos: 'reigion' → 'region' (2 instances)
• Fix image path typos: 'jsoncole' → 'jconsole' (2 instances)
• Fix broken template variable: {{base}} → {{base_path}}

These corrections improve documentation accuracy and consistency across multiple versions of the documentation.

Security checks

• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets

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📥 Commits

Reviewing files that changed from the base of the PR and between 3777d44 and 5c1df0d.

📒 Files selected for processing (14)

• CHANGES_MADE.md
• en/docs/ai-gateway/mcp-gateway/subscribe-to-a-mcp-server.md
• en/docs/api-design-manage/deploy-and-publish/deploy-on-gateway/api-gateway/maintaining-separate-production-and-sandbox-gateways.md
• en/docs/api-design-manage/deploy-and-publish/deploy-on-gateway/api-gateway/response-caching.md
• en/docs/api-design-manage/design/api-documentation/add-api-documentation.md
• en/docs/api-gateway/federated-gateways/configure-custom-gateway-agent.md
• en/docs/api-gateway/maintaining-separate-production-and-sandbox-gateways.md
• en/docs/api-gateway/response-caching.md
• en/docs/api-security/runtime/authorization/role-based-access-control-using-xacml.md
• en/docs/apiops/cli/managing-apis-api-products/importing-apis-via-dev-first-approach.md
• en/docs/apiops/cli/managing-mcp-servers/importing-mcp-servers-via-dev-first-approach.md
• en/docs/monitoring/api-analytics/on-prem/elk-installation-guide.md
• en/docs/monitoring/api-analytics/on-prem/opensearch-installation-guide.md
• en/docs/reference/faq.md

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