fixed typo in comment in netbase.h and bignum.h

src/bignum.h

@@ -47,7 +47,7 @@ public:
 };
 
 
-/** C++ wrapper for BIGNUM (OpenSSl bignum) */
+/** C++ wrapper for BIGNUM (OpenSSL bignum) */
 class CBigNum : public BIGNUM
 {
 public:

src/netbase.h

@@ -81,7 +81,7 @@ class CNetAddr
             )
 };
 
-/** A combnation of a network address (CNetAddr) and a (TCP) port */
+/** A combination of a network address (CNetAddr) and a (TCP) port */
 class CService : public CNetAddr
 {
     protected: