refactor: reordered PHP tracer installation examples from APM-only to…

[aminenaim]

What does this PR do? What is the motivation?

Reorders the PHP installer commands so the APM-only install comes first and add a note advising to install only required capabilities

Today the full APM + AAP + Profiling command is listed first, and readers/agents often accidentally copy it by default.

Before:

# Full installation: APM + AAP + Profiling
php datadog-setup.php --php-bin=all --enable-appsec --enable-profiling

# APM only
php datadog-setup.php --php-bin=all

# APM + AAP
php datadog-setup.php --php-bin=all --enable-appsec

# APM + Profiling
php datadog-setup.php --php-bin=all --enable-profiling

After:

# APM only
php datadog-setup.php --php-bin=all

# APM + AAP
php datadog-setup.php --php-bin=all --enable-appsec

# APM + Profiling
php datadog-setup.php --php-bin=all --enable-profiling

# Full installation: APM + AAP + Profiling
php datadog-setup.php --php-bin=all --enable-appsec --enable-profiling

Merge readiness

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/aminenaim/php-install-defaults-first/tracing/trace_collection/dd_libraries/php