[5017] Addressed two minor comments:

 - removed "Linux" from advanced.json
 - corrected one typo

doc/examples/kea4/advanced.json

@@ -27,7 +27,7 @@
         // of receiving all traffic every time and a downside of bypassing
         // all firewall rules and having marginally bigger performance impact.
         // 'udp' is generally better if you have only relayed traffic. Kea
-        // than opens up normal UDP socket and Linux kernel does all the
+        // than opens up normal UDP socket and the kernel does all the
         // Ethernet/IP stack processing.
         "dhcp-socket-type": "udp"
     },

src/bin/dhcp4/tests/parser_unittest.cc

@@ -591,7 +591,7 @@ TEST(ParserTest, unicodeEscapes) {
     }
 }
 
-// This test checks that all represenations of a slash is recognized properly.
+// This test checks that all representations of a slash is recognized properly.
 TEST(ParserTest, unicodeSlash) {
     // check the 4 possible encodings of solidus '/'
     ConstElementPtr result;