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>