Remove backslash.

It seems in this context, one doesn't escape _.

https://boringssl.googlesource.com/boringssl/+/HEAD/INCORPORATING.md#Bazel

Change-Id: I7ec587de8e9d033a3cb9f108ec645e4ce5e0c4fc
Reviewed-on: https://boringssl-review.googlesource.com/8660
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/INCORPORATING.md b/INCORPORATING.md
index 5ab8a60..38e9d79 100644
--- a/INCORPORATING.md
+++ b/INCORPORATING.md
@@ -12,7 +12,7 @@
 
 For example:
 
-    git\_repository(
+    git_repository(
         name = "boringssl",
         commit = "_some commit_",
         remote = "https://boringssl.googlesource.com/boringssl",