doc: cookbook: Fix ‘file system’ spelling.

* doc/guix-cookbook.texi (Getting help, Customizing the Kernel):
Fix ‘file system’ spelling.

doc/guix-cookbook.texi

@@ -1288,7 +1288,7 @@ version or compilation options.
 @subsection Getting help
 
 Sadly, some applications can be tough to package.  Sometimes they need a patch to
-work with the non-standard filesystem hierarchy enforced by the store.
+work with the non-standard file system hierarchy enforced by the store.
 Sometimes the tests won't run properly.  (They can be skipped but this is not
 recommended.)  Other times the resulting package won't be reproducible.
 
@@ -1501,7 +1501,7 @@ custom kernel:
 @lisp
 (define %macbook41-full-config
   (append %macbook41-config-options
-          %filesystems
+          %file-systems
           %efi-support
           %emulation
           (@@@@ (gnu packages linux) %default-extra-linux-options)))
@@ -1517,8 +1517,8 @@ custom kernel:
                       #:extra-options %macbook41-config-options))
 @end lisp
 
-In the above example @code{%filesystems} is a collection of flags enabling
-different filesystem support, @code{%efi-support} enables EFI support and
+In the above example @code{%file-systems} is a collection of flags enabling
+different file system support, @code{%efi-support} enables EFI support and
 @code{%emulation} enables a x86_64-linux machine to act in 32-bit mode also.
 @code{%default-extra-linux-options} are the ones quoted above, which had to be
 added in since they were replaced in the @code{extra-options} keyword.
@@ -1582,7 +1582,7 @@ The second way to setup the kernel configuration makes more use of Guix's
 features and allows you to share configuration segments between different
 kernels.  For example, all machines using EFI to boot have a number of EFI
 configuration flags that they need.  It is likely that all the kernels will
-share a list of filesystems to support.  By using variables it is easier to
+share a list of file systems to support.  By using variables it is easier to
 see at a glance what features are enabled and to make sure you don't have
 features in one kernel but missing in another.