am 51e99cf9: am b50e7e0f: am 65b59f50: am 1af587b3: am 4623c0d8: docs: Add basic tool help pages for SDK and AVD Manager. The SDK Manager page is needed particularly as a reference by some pages rather than pointing to the installation guide.

* commit '51e99cf91e18a4f0dd5449a122f356ae10727cdf':
  docs: Add basic tool help pages for SDK and AVD Manager. The SDK Manager page is needed particularly as a reference by some pages rather than pointing to the installation guide.