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docs: vm: zswap.rst: replace some characters

The conversion tools used during DocBook/LaTeX/html/Markdown->ReST
conversion and some cut-and-pasted text contain some characters that
aren't easily reachable on standard keyboards and/or could cause
troubles when parsed by the documentation build system.

Replace the occurences of the following characters:

- U+00a0 (' '): NO-BREAK SPACE
as it can cause lines being truncated on PDF output

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/9a93b72f99f8f3328269076ceff50248ac9c5af5.1623826294.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

authored by

Mauro Carvalho Chehab and committed by
Jonathan Corbet 1a967a31 570eb861

+2 -2
+2 -2
Documentation/vm/zswap.rst
··· 10 10 Zswap is a lightweight compressed cache for swap pages. It takes pages that are 11 11 in the process of being swapped out and attempts to compress them into a 12 12 dynamically allocated RAM-based memory pool. zswap basically trades CPU cycles 13 - for potentially reduced swap I/O.  This trade-off can also result in a 13 + for potentially reduced swap I/O. This trade-off can also result in a 14 14 significant performance improvement if reads from the compressed cache are 15 15 faster than reads from a swap device. 16 16 ··· 26 26 performance impact of swapping. 27 27 * Overcommitted guests that share a common I/O resource can 28 28 dramatically reduce their swap I/O pressure, avoiding heavy handed I/O 29 - throttling by the hypervisor. This allows more work to get done with less 29 + throttling by the hypervisor. This allows more work to get done with less 30 30 impact to the guest workload and guests sharing the I/O subsystem 31 31 * Users with SSDs as swap devices can extend the life of the device by 32 32 drastically reducing life-shortening writes.