Fixed common misspellings.

Mostly found by 'codespell'.

src/libstrongswan/utils/enumerator.h

@@ -36,7 +36,7 @@ struct enumerator_t {
 	 * The enumerate function takes a variable argument list containing
 	 * pointers where the enumerated values get written.
 	 *
-	 * @param ...	variable list of enumerated items, implementation dependant
+	 * @param ...	variable list of enumerated items, implementation dependent
 	 * @return		TRUE if pointers returned
 	 */
 	bool (*enumerate)(enumerator_t *this, ...);

src/libstrongswan/utils/host.c

@@ -40,7 +40,7 @@ struct private_host_t {
 	host_t public;
 
 	/**
-	 * low-lewel structure, wich stores the address
+	 * low-lewel structure, which stores the address
 	 */
 	union {
 		/** generic type */

src/libstrongswan/utils/identification.h

@@ -293,7 +293,7 @@ struct identification_t {
  *
  * In favour of pluto, domainnames are prepended with an @, since
  * pluto resolves domainnames without an @ to IPv4 addresses. Since
- * we use a seperate host_t class for addresses, this doesn't
+ * we use a separate host_t class for addresses, this doesn't
  * make sense for us.
  *
  * A distinguished name may contain one or more of the following RDNs: