Adjust the title levels in context-bounds.md

Author: ShapelessCat

docs/docs/reference/contextual/context-bounds.md

@@ -3,26 +3,31 @@ layout: doc-page
 title: "Context Bounds"
 ---
 
-## Context Bounds
-
 A context bound is a shorthand for expressing the common pattern of a context parameter that depends on a type parameter. Using a context bound, the `maximum` function of the last section can be written like this:
+
 ```scala
 def maximum[T: Ord](xs: List[T]): T = xs.reduceLeft(max)
 ```
+
 A bound like `: Ord` on a type parameter `T` of a method or class indicates a context parameter `with Ord[T]`. The context parameter(s) generated from context bounds come last in the definition of the containing method or class. E.g.,
+
 ```scala
 def f[T: C1 : C2, U: C3](x: T)(using y: U, z: V): R
 ```
+
 would expand to
+
 ```scala
 def f[T, U](x: T)(using y: U, z: V)(using C1[T], C2[T], C3[U]): R
 ```
+
 Context bounds can be combined with subtype bounds. If both are present, subtype bounds come first, e.g.
+
 ```scala
 def g[T <: B : C](x: T): R = ...
 ```
 
-### Migration
+## Migration
 
 To ease migration, context bounds in Dotty map in Scala 3.0 to old-style implicit parameters
 for which arguments can be passed either with a `(using ...)` clause or with a normal application. From Scala 3.1 on, they will map to context parameters instead, as is described above.
@@ -32,7 +37,7 @@ context parameter stemming from a context bound with a normal argument will give
 warning. The warning indicates that a `(using ...)` clause is needed instead. The rewrite can be
 done automatically under `-rewrite`.
 
-### Syntax
+## Syntax
 
 ```
 TypeParamBounds   ::=  [SubtypeBounds] {ContextBound}