Spelling fixes

* accumulating
* acquire
* alignment
* appropriate
* argument
* assign
* attribute
* authenticate
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* authority
* auxiliary
* brackets
* callback
* camellia
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* chunk
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* libstrongswan
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* treshold
* unique
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* unknown
* until
* upper
* using
* validator
* verification
* version
* version
* warrior

Closes strongswan/strongswan#164.

src/libstrongswan/plugins/pem/pem_encoder.c

@@ -120,7 +120,7 @@ bool pem_encoder_encode(cred_encoding_type_t type, chunk_t *encoding,
 			}
 			if (cred_encoding_args(args, CRED_PART_PKCS10_ASN1_DER,
 								   &asn1, CRED_PART_END))
-			{	/* PEM encode PKCS10 certificate reqeuest */
+			{	/* PEM encode PKCS10 certificate request */
 				label = "CERTIFICATE REQUEST";
 				break;
 			}