doc: update "Singleton Types" section header from H4 -> H3 (#30717)

(cherry picked from commit 384eb30)
JuliaLang · Feb 11, 2019 · 6bc6e9a · 6bc6e9a
1 parent 475fe22
commit 6bc6e9a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/doc/src/manual/types.md b/doc/src/manual/types.md
@@ -938,7 +938,7 @@ julia> NamedTuple{(:a, :b)}((1,""))
 If field types are specified, the arguments are converted. Otherwise the types of the arguments
 are used directly.
 
-#### [Singleton Types](@id man-singleton-types)
+### [Singleton Types](@id man-singleton-types)
 
 There is a special kind of abstract parametric type that must be mentioned here: singleton types.
 For each type, `T`, the "singleton type" `Type{T}` is an abstract type whose only instance is