[S32::Str] substr is not rw anymore, but substr-rw is

S32-setting-library/Str.pod

@@ -500,12 +500,12 @@ C<sprintf($format, $p.key, $p.value)>.
 
 =item substr
 
- multi method substr (Str $string: StrPos $start, StrLen $length? --> Str ) is rw is export
- multi method substr (Str $string: StrPos $start, StrPos $end --> Str ) is rw is export
- multi method substr (Str $string: StrPos $start, Int $length --> Str ) is rw is export
- multi method substr (Str $string: Int $start, StrLen $length? --> Str ) is rw is export
- multi method substr (Str $string: Int $start, StrPos $end --> Str ) is rw is export
- multi method substr (Str $string: Int $start, Int $length --> Str ) is rw is export
+ multi method substr (Str $string: StrPos $start, StrLen $length? --> Str ) is export
+ multi method substr (Str $string: StrPos $start, StrPos $end --> Str ) is export
+ multi method substr (Str $string: StrPos $start, Int $length --> Str ) is export
+ multi method substr (Str $string: Int $start, StrLen $length? --> Str ) is export
+ multi method substr (Str $string: Int $start, StrPos $end --> Str ) is export
+ multi method substr (Str $string: Int $start, Int $length --> Str ) is export
 
 C<substr> returns part of an existing string. You control what part by
 passing a starting position and optionally either an end position or length.
@@ -530,7 +530,7 @@ this case the entire rest of the string is returned, whatever is available.
 
 =item substr-rw
 
- multi sub substr-rw($s is rw, $from = 0; $chars = $s.chars - $from)
+ multi sub substr-rw($s is rw, $from = 0; $chars = $s.chars - $from) is rw
 
 A version of C<substr> that returns a writable reference to a part of a
 string variable: