Address review comments.

ql/examples/snippets/constant.ql

@@ -11,4 +11,4 @@ import go
 
 from DataFlow::Node zero
 where zero.getNumericValue() = 0
-select zero
+select zero

ql/examples/snippets/fieldread.ql

@@ -8,9 +8,8 @@
 
 import go
 
-from Type reqtp, Field reqm, DataFlow::Read read
+from Field reqm, Read read
 where
-  reqtp.hasQualifiedName("net/http", "Request") and
-  reqm = reqtp.getField("Method") and
+  reqm.hasQualifiedName("net/http", "Request", "Method") and
   read = reqm.getARead()
 select read

ql/examples/snippets/fieldwrite.ql

@@ -8,9 +8,8 @@
 
 import go
 
-from Type response, Field status, DataFlow::Write write
+from Field status, Write write
 where
-  response.hasQualifiedName("net/http", "Response") and
-  status = response.getField("Status") and
+  status.hasQualifiedName("net/http", "Response", "Status") and
   write = status.getAWrite()
 select write, write.getRhs()

ql/examples/snippets/type.ql

@@ -8,6 +8,6 @@
 
 import go
 
-from Type response
-where response.hasQualifiedName("net/http", "Request")
-select response
+from Type request
+where request.hasQualifiedName("net/http", "Request")
+select request

ql/examples/snippets/varread.ql

@@ -7,7 +7,7 @@
 
 import go
 
-from Variable err, DataFlow::Read read
+from Variable err, Read read
 where
   err.getName() = "err" and
   read = err.getARead()

ql/examples/snippets/varwrite.ql

@@ -7,7 +7,7 @@
 
 import go
 
-from Variable err, DataFlow::Write write
+from Variable err, Write write
 where
   err.getName() = "err" and
   write = err.getAWrite()