[DOC] Fix String#getbyte doc
String#getbyte returns nil if index is out of range.
nil
index
Add String#getbyte example with nil output.
Modify String#getbyte example to use negative index.
[DOC] Fix String#getbyte doc
String#getbyte returns
nilifindexis out of range.Add String#getbyte example with nil output.
Modify String#getbyte example to use negative index.