Fix a few spelling mistakes

Author: timgates42

docs/source/conf.py

@@ -310,7 +310,7 @@
 # The format is a list of tuples containing the path and title.
 #epub_pre_files = []
 
-# HTML files shat should be inserted after the pages created by sphinx.
+# HTML files that should be inserted after the pages created by sphinx.
 # The format is a list of tuples containing the path and title.
 #epub_post_files = []
 

jose.py

@@ -644,7 +644,7 @@ class _JWA(object):
 
     def __getitem__(self, key):
         """ Derive implementation(s) from key
-        If key is compond <encryption>(-|+)<hash> then it will return a tuple
+        If key is compound <encryption>(-|+)<hash> then it will return a tuple
         of implementations.
         Each implementation is a tuple in following format:
         - for hash algorithms ((<sign function>, <verify function>), <mod>)

tests.py

@@ -169,7 +169,7 @@ def test_jwe_adata(self):
             jwt = jose.legacy_decrypt(jose.deserialize_compact(et), rsa_priv_key,
                     adata=adata)
 
-            # make sure signaures don't match when adata isn't passed in
+            # make sure signatures don't match when adata isn't passed in
             try:
                 hdr, dt = jose.legacy_decrypt(jose.deserialize_compact(et),
                     rsa_priv_key)