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docs: admin-guide: update to current minimum pipe size default

The pipe size limit used when the fs.pipe-user-pages-soft sysctl value
is reached was increased from one to two pages in commit 46c4c9d1beb7;
update the documentation to match the new reality.

Fixes: 46c4c9d1beb7 ("pipe: increase minimum default pipe size to 2 pages")
Signed-off-by: Štěpán Němec <stepnem@smrk.net>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250729-pipedoc-v2-1-18b8e735a9c6@smrk.net

authored by

Štěpán Němec and committed by
Jonathan Corbet 7069b529 4fff5db4

+2 -2
+2 -2
Documentation/admin-guide/sysctl/fs.rst
··· 164 164 -------------------- 165 165 166 166 Maximum total number of pages a non-privileged user may allocate for pipes 167 - before the pipe size gets limited to a single page. Once this limit is reached, 168 - new pipes will be limited to a single page in size for this user in order to 167 + before the pipe size gets limited to two pages. Once this limit is reached, 168 + new pipes will be limited to two pages in size for this user in order to 169 169 limit total memory usage, and trying to increase them using ``fcntl()`` will be 170 170 denied until usage goes below the limit again. The default value allows to 171 171 allocate up to 1024 pipes at their default size. When set to 0, no limit is