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e29e1ee6 - libtextstyle: Clarify memory_stream_contents function.

libtextstyle: Clarify memory_stream_contents function. * libtextstyle/gnulib-local/lib/memory-ostream.oo.h (memory_stream::contents): Clarify extent of return values. * libtextstyle/doc/libtextstyle.texi (The memory_ostream class): Likewise.