Fix some typos in best-practices doc.
@@ -82,7 +82,7 @@ Everything should be built from source whenever possible. Generally this means t
depending on a library `some-library.so`, you'd create a BUILD file and build `some-library.so`
from its sources, then depend on that target.
-Building from source prevents a build from using an library that was build with incompatible flags
+Building from source prevents a build from using a library that was built with incompatible flags
or a different architecture. There are also some features like coverage, static analysis, or
dynamic analysis that will only work on the source.
