Revert "[Docs] Add wiki content to Markdown docs"

docs/how_to_contribute.md

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-# How to get an LSS change committed
-
-## Review
-
-You get your change reviewed, you can upload it to
-http://codereview.chromium.org (Rietveld) using `git cl upload` from Chromium's
-`depot-tools`.
-
-## Testing
-
-Unfortunately, LSS has no automated test suite.
-
-You can test LSS by patching it into Chromium, building Chromium, and running
-Chromium's tests. (See [ProjectsUsingLSS](projects_using_lss.md).)
-
-You can compile-test LSS by running:
-
-    gcc -Wall -Wextra -Wstrict-prototypes -c linux_syscall_support.h
-
-## Rolling into Chromium
-
-If you commit a change to LSS, please also commit a Chromium change to update
-`lss_revision` in Chromium's DEPS file.
-
-This ensures that the LSS change gets tested, so that people who commit later
-LSS changes don't run into problems with updating `lss_revision`.