Fix typo.

Change-Id: I989fcd8fd6c523f8d5b2c58229095402692ee63a
diff --git a/liblog/include/log/log_main.h b/liblog/include/log/log_main.h
index 3e977ef..0cb7dd7 100644
--- a/liblog/include/log/log_main.h
+++ b/liblog/include/log/log_main.h
@@ -27,7 +27,7 @@
 /*
  * Normally we strip the effects of ALOGV (VERBOSE messages),
  * LOG_FATAL and LOG_FATAL_IF (FATAL assert messages) from the
- * release builds be defining NDEBUG.  You can modify this (for
+ * release builds by defining NDEBUG.  You can modify this (for
  * example with "#define LOG_NDEBUG 0" at the top of your source
  * file) to change that behavior.
  */