/usr/share/puredata/doc/5.reference/noise~-help.pd is in puredata-core 0.46.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #N canvas 174 90 458 270 12;
#X floatatom 77 178 4 0 0;
#X obj 77 111 noise~;
#X obj 167 149 print~;
#X msg 167 123 bang;
#X obj 282 89 loadbang;
#X msg 282 114 \; pd dsp 1;
#X obj 77 150 env~ 4096;
#X text 67 204 RMS in dB;
#X text 171 242 updated for Pd version 0.33;
#X obj 20 11 noise~;
#X text 84 11 - uniformly distributed white noise;
#X text 38 49 the output range is -1 to 1...;
#X connect 1 0 2 0;
#X connect 1 0 6 0;
#X connect 3 0 2 0;
#X connect 4 0 5 0;
#X connect 6 0 0 0;
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