add examples for string/trimr

Author: rwtolbert

examples/string_47trimr.janet

@@ -0,0 +1,8 @@
+# trim trailing/right side whitespace
+(string/trimr "  foo ") # -> "  foo"
+
+# default whitespace includes " \t\r\n\v\f"
+(string/trimr "\t bar\n\r\f") # -> "\t bar"
+
+# provide custom set of characters to trimr
+(string/trimr "_.foo_bar. \n" " ._\n") # -> "_.foo_bar"