NGINX Plus: Fix inconsistent quoting in access log format example

[travisamartin]

Description

This PR fixes a minor inconsistency in the access log format example under the "Setting Up the Access Log" section.

Closes #464

Previously, $request_time was not quoted while the other upstream time variables ($upstream_connect_time, $upstream_header_time, $upstream_response_time) were.
For consistency and to prevent possible confusion when parsing logs, $request_time is now also surrounded by double quotes.

Changes

• Updated the log_format example to quote $request_time consistently.

http {
    log_format upstream_time '$remote_addr - $remote_user [$time_local] '
                             '"$request" $status $body_bytes_sent '
                             '"$http_referer" "$http_user_agent"'
                             'rt="$request_time" uct="$upstream_connect_time" uht="$upstream_header_time" urt="$upstream_response_time"';

    server {
        access_log /spool/logs/nginx-access.log upstream_time;
        ...
    }
}

Related Feedback

• Based on user survey feedback (Response ID: R_32x2MusOk4P1dto).

Impact

• Improves clarity and consistency in the documentation examples.
• No functional changes to NGINX behavior.

[github-actions]

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