[GRAPHX][EXAMPLES] move graphx test data directory and update graphx document #14010
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What changes were proposed in this pull request?
There are two test data files used for graphx examples existing in directory "graphx/data"
I move it into "data/" directory because the "graphx" directory is used for code files and other test data files (such as mllib, streaming test data) are all in there.
I also update the graphx document where reference the data files which I move place.
How was this patch tested?
N/A