Documentation: filesystems: configfs: drop doubled word

Drop the doubled word "be".

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: [e-mail]
Cc: Joel Becker <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/filesystems/configfs.rst

···
 If an attribute is readable and provides a ->show method, that method will
 be called whenever userspace asks for a read(2) on the attribute.  If an
 attribute is writable and provides a ->store  method, that method will be
-be called whenever userspace asks for a write(2) on the attribute.
+called whenever userspace asks for a write(2) on the attribute.
 
 struct configfs_bin_attribute
 =============================