Pads a string on the right to a specified length.
StringPadRight["string", n]
StringPadRight["string", n, "padding"]
StringPadRight[{"s1", "s2", …}]
StringPadRight[{"s1", "s2", …}, n, …]
StringPadRight["hi", 5, "0"]
→ hi000StringPadRight["hello", 3]
→ helStringPadRight[{"a", "ab", "abc"}]
→ {a , ab , abc}