/usr/lib/puredata/doc/3.audio.examples/J03.pulse.width.mod.pd is in puredata-doc 0.43.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X text 57 9 CLASSICAL PULSE WIDTH MODULATION;
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#X text 24 314 This patch demonstrates pulse width modulation \, which
is accomplished simply by subtracting two sawtooth waves at a varying
phase difference. Here their frequencies are set to differ by 1/5 Hz.
so that the relative phase wanders continuously.;
#X text 570 457 ---- 0.02 seconds ----;
#X text 524 487 updated for Pd version 0.39;
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