add SubStr to manual (#24125)

base/strings/types.jl

@@ -10,6 +10,17 @@
 
 Like [`getindex`](@ref), but returns a view into the parent string `s`
 within range `i:j` or `r` respectively instead of making a copy.
+
+# Examples
+```jldoctest
+julia> SubString("abc", 1, 2)
+"ab"
+
+julia> SubString("abc", 1:2)
+"ab"
+
+julia> SubString("abc", 2)
+"bc"
 """
 struct SubString{T<:AbstractString} <: AbstractString
     string::T

doc/src/manual/strings.md

@@ -230,7 +230,7 @@ The former is a single character value of type `Char`, while the latter is a str
 happens to contain only a single character. In Julia these are very different things.
 
 Range indexing makes a copy of the selected part of the original string.
-Alternatively, it is possible to create a view into a string using the type `SubString`,
+Alternatively, it is possible to create a view into a string using the type [`SubString`](@ref),
 for example:
 
 ```jldoctest
@@ -245,7 +245,7 @@ SubString{String}
 ```
 
 Several standard functions like [`chop`](@ref), [`chomp`](@ref) or [`strip`](@ref)
-return a `SubString`.
+return a [`SubString`](@ref).
 
 ## Unicode and UTF-8
 

doc/src/stdlib/strings.md

@@ -10,6 +10,7 @@ Base.repeat(::AbstractString, ::Integer)
 Base.repeat(::Char, ::Integer)
 Base.repr
 Core.String(::AbstractString)
+Base.SubString
 Base.transcode
 Base.unsafe_string
 Base.codeunit(::AbstractString, ::Integer)