CURLOPT_GSSAPI_DELEGATION.3: Use GSS-API rather than GSSAPI

As implementations are refereed to GSS-API libraries as per the RFC and
GSSAPI typically refers to an authentication mechanism.

docs/libcurl/opts/CURLOPT_GSSAPI_DELEGATION.3

@@ -32,7 +32,7 @@ Set the long parameter \fIlevel\fP to CURLGSSAPI_DELEGATION_FLAG to allow
 unconditional GSSAPI credential delegation.  The delegation is disabled by
 default since 7.21.7.  Set the parameter to CURLGSSAPI_DELEGATION_POLICY_FLAG
 to delegate only if the OK-AS-DELEGATE flag is set in the service ticket in
-case this feature is supported by the GSSAPI implementation and the definition
+case this feature is supported by the GSS-API implementation and the definition
 of GSS_C_DELEG_POLICY_FLAG was available at compile-time.
 .SH DEFAULT
 CURLGSSAPI_DELEGATION_NONE