Fix the link to protoc installation instructions.

To install protoc, users should follow instructions in the
file (INSTALL.txt has been removed because it misses crucial info
and confuses users).
diff --git a/examples/ b/examples/
index aea0f02..b65f8c5 100644
--- a/examples/
+++ b/examples/
@@ -43,7 +43,7 @@
 OPTIONAL - Rebuilding the generated code
-1 First [install protoc](
+1 First [install protoc](
   - For now, this needs to be installed from source
   - This is will change once proto3 is officially released