docs: livepatch: Fix a typo and remove the unnecessary gaps in a sentence

s/varibles/variables/

...and remove leading spaces from a sentence.
Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210305100923.3731-1-unixbhaskar@gmail.com
[jc: performed suggested prepositional tweak]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/livepatch/shadow-vars.rst

@@ -165,8 +165,8 @@ In-flight parent objects
 
 Sometimes it may not be convenient or possible to allocate shadow
 variables alongside their parent objects.  Or a livepatch fix may
-require shadow varibles to only a subset of parent object instances.  In
-these cases, the klp_shadow_get_or_alloc() call can be used to attach
+require shadow variables for only a subset of parent object instances.
+In these cases, the klp_shadow_get_or_alloc() call can be used to attach
 shadow variables to parents already in-flight.
 
 For commit 1d147bfa6429, a good spot to allocate a shadow spinlock is