There's also http://docs.python.org/tutorial/introduction.html#strings, http://docs.python.org/library/string.html and http://docs.python.org/library/stdtypes.html#sequence-types-.... There's a fair bit of duplication in there, yes, but I think it's a pretty good coverage overall.

There are some absolute doozies in the Ruby documentation, particularly around IO and the Socket hierarchy. String is relatively ok.