Guards Update: cannedKeyAlgoNames

1. Update the guards around the strings used to make the
   cannedKeyAlgoNames. If any algorithm is disabled, leave it out of the
   list. (I'm looking at you Ed25519!)
2. Added comments to those guards.
3. Reflow the alignment.

src/internal.c

@@ -738,17 +738,25 @@ static const char cannedKexAlgoNames[] =
 #endif
 
 static const char cannedKeyAlgoNames[] =
+#ifndef WOLFSSH_NO_ED25519
     "ssh-ed25519,"
+#endif /* WOLFSSH_NO_ED25519 */
+#ifndef WOLFSSH_NO_RSA_SHA2_256
     "rsa-sha2-256,"
+#endif/* WOLFSSH_NO_RSA_SHA2_256 */
+#ifndef WOLFSSH_NO_ECDSA_SHA2_NISTP256
     "ecdsa-sha2-nistp256,"
+#endif /* WOLFSSH_NO_ECDSA_SHA2_NISTP256 */
 #ifdef WOLFSSH_CERTS
-    "x509v3-ecdsa-sha2-nistp256,"
+    #ifndef WOLFSSH_NO_ECDSA_SHA2_NISTP256
+        "x509v3-ecdsa-sha2-nistp256,"
+    #endif /* WOLFSSH_NO_ECDSA_SHA2_NISTP256 */
     #ifdef WOLFSSH_NO_SHA1_SOFT_DISABLE
         "x509v3-ssh-rsa,"
     #endif /* WOLFSSH_NO_SHA1_SOFT_DISABLE */
 #endif /* WOLFSSH_CERTS */
 #ifdef WOLFSSH_NO_SHA1_SOFT_DISABLE
-        "ssh-rsa,"
+    "ssh-rsa,"
 #endif /* WOLFSSH_NO_SHA1_SOFT_DISABLE */
     "";