/usr/src/xtables-addons-3.0/extensions/libxt_ECHO.man is in xtables-addons-dkms 3.0-0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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The \fBECHO\fP target will send back all packets it received. It serves as an
examples for an Xtables target.
.PP
ECHO takes no options.
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