Documentation: change "&" to "and" in Documentation/applying-patches.txt

http://english.stackexchange.com/questions/3127/when-to-use-instead-of-and

Signed-off-by: Oscar Utbult <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

Documentation/applying-patches.txt

···
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  When patch applies a patch file it attempts to verify the sanity of the
 file in different ways.
-Checking that the file looks like a valid patch file & checking the code
+Checking that the file looks like a valid patch file and checking the code
 around the bits being modified matches the context provided in the patch are
 just two of the basic sanity checks patch does.