chore: fix trace filter example

[wantsui]

The if statement doesn't work if you copy and paste the example as is. This is a quick fix.

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

docs/advanced_usage.rst                                                 @DataDog/python-guild

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 238 ± 3 ms.

The average import time from base is: 241 ± 3 ms.

The import time difference between this PR and base is: -2.8 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 2.081 ms (0.88%)

ddtrace.bootstrap.sitecustomize 1.401 ms (0.59%)

ddtrace.bootstrap.preload 1.401 ms (0.59%)

ddtrace.internal.remoteconfig.client 0.685 ms (0.29%)

ddtrace 0.680 ms (0.29%)

ddtrace.internal._unpatched 0.026 ms (0.01%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-05-28 19:41:19

Comparing candidate commit be91d57 in PR branch fix-docs with baseline commit 58bd69c in branch main.

Found 2 performance improvements and 5 performance regressions! Performance is the same for 502 metrics, 7 unstable metrics.

scenario:iastaspects-lower_aspect

• 🟥 execution_time [+206.717ns; +240.371ns] or [+9.043%; +10.516%]

scenario:iastaspects-lstrip_aspect

• 🟥 execution_time [+1.508µs; +1.593µs] or [+11.595%; +12.245%]

scenario:iastaspects-strip_aspect

• 🟥 execution_time [+1.064µs; +1.392µs] or [+8.160%; +10.675%]

scenario:iastaspectsospath-ospathnormcase_aspect

• 🟥 execution_time [+462.851ns; +510.823ns] or [+13.328%; +14.709%]

scenario:iastaspectssplit-splitlines_aspect

• 🟥 execution_time [+209.386ns; +248.436ns] or [+14.409%; +17.096%]

scenario:iastdjangostartup-appsec

• 🟩 execution_time [-1.086s; -1.000s] or [-55.385%; -51.013%]

scenario:iastdjangostartup-tracer

• 🟩 execution_time [-865.945ms; -769.730ms] or [-49.207%; -43.740%]