Add some missing linebreaks to create code blocks

Author: MasterDuke17

doc/Type/Cool.pod6

@@ -861,6 +861,7 @@ C<$pattern> is applied to the remaining characters of C<$string>.
 =head2 method uniprop
 
 Defined as:
+
     sub uniprop(Str(Cool), |c)
     sub uniprop(Int:D $code, Stringy:D $propname)
     sub uniprop(Str, $propname, Stringy:D $propname)
@@ -880,6 +881,7 @@ Returns a Bool for Boolean properties.
 =head2 method uniprops
 
 Defined as:
+
     sub uniprops(Str:D $str, Stringy:D $propname = "General_Category")
 
 Interprets the invocant as a L<Str|/type/Str>, and returns the
@@ -931,6 +933,7 @@ codepoints in that character.
 =head2 method unimatch
 
 Defined as:
+
     sub unimatch(Str:D $str, |c)
     unimatch(Int:D $code, Stringy:D $pvalname, Stringy:D $propname = $pvalname)