collapse two redundant tour sections into one

SethTisue · SethTisue · commit e7b3b424de33 · 2018-01-16T14:30:13.000-08:00
diff --git a/_tour/local-type-inference.md b/_tour/local-type-inference.md
diff --git a/_tour/operators.md b/_tour/operators.md
@@ -8,7 +8,7 @@ partof: scala-tour
 
 num: 30
 next-page: by-name-parameters
-previous-page: local-type-inference
+previous-page: type-inference
 prerequisite-knowledge: case-classes
 
 redirect_from: "/tutorials/tour/operators.html"
diff --git a/_tour/polymorphic-methods.md b/_tour/polymorphic-methods.md
@@ -8,7 +8,7 @@ partof: scala-tour
 
 num: 28
 
-next-page: local-type-inference
+next-page: type-inference
 previous-page: implicit-conversions
 prerequisite-knowledge: unified-types
 
diff --git a/_tour/type-inference.md b/_tour/type-inference.md
@@ -6,8 +6,9 @@ discourse: true
 
 partof: scala-tour
 
-num: 36
-previous-page: packages-and-imports
+num: 29
+next-page: operators
+previous-page: polymorphic-methods
 ---
 
 The Scala compiler can often infer the type of an expression so you don't have to declare it explicitly.
