Fix broken link: s/html/md/
MOS_MIGRATED_REVID=150431342
@@ -8,7 +8,7 @@ title: Macros
A macro is a function called from the BUILD file that can instantiate rules.
Macros don't give additional power, they are just used for encapsulation and
-code reuse. By the end of the [loading phase](concepts.html#evaluation-model),
+code reuse. By the end of the [loading phase](concepts.md#evaluation-model),
macros don't exist anymore, and Bazel sees only the set of rules they created.
Native rules (i.e. rules that don't need a `load()` statement) can be
