[sr #108262] Correct quoting for a parameter in the documentation

[Eric Blake]

Follow-up Comment #6, sr #108262 (project autoconf):

Autoconf does not escape ' in variables stored for make.  While it is possible
to write code for GNU make that can escape ' in an arbitrary make variable, it
is up to you to write your Makefile.in to request this treatment.  Automake
does not do this sort of escaping for projects using Makefile.am (because it
cannot be portably done with non-GNU make), but Automake-NG will target only
GNU make and so it might provide ways to safely escape all possible path
names, including ones with ' in the name.  Basically, the autoconf approach is
to assume that space is much more likely than single quote to appear in a
filename; therefore, writing a make expansion that is in turn passed to the
shell is much more likely to be useful if it uses shell single quoting to
protect any spaces in the textual make expansion, and assume that the make
expansion will never produce a single quote that completely throws off shell
parsing.

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