Imported from GitHub PR https://github.com/tensorflow/tensorflow/pull/33475

Minor change to the README, adding both TF 1.15 and 2.x releases to the list of ROCm CSB links

CC:  @sunway513
Copybara import of the project:

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97f8bb35fbe2eace9499e2242eec54de0114a0c6 by Jeff Poznanovic <jeffrey.poznanovic@amd.com>:

Updating the README.md with ROCm CSB links

Minor change to the README, adding both TF 1.15 and 2.x releases to the list of ROCm CSB links

COPYBARA_INTEGRATE_REVIEW=https://github.com/tensorflow/tensorflow/pull/33475 from parallelo:patch-1 97f8bb35fbe2eace9499e2242eec54de0114a0c6
PiperOrigin-RevId: 275917433
Change-Id: I11ebf8c64ebc66e55316ea503ede2834a39676a4