Update BUILD file to list all docs
This change adds only "skylark/errors/read-only-variable.md" for now.
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PiperOrigin-RevId: 143183688
MOS_MIGRATED_REVID=143183688
diff --git a/site/versions/master/docs/skylark/errors/read-only-variable.md b/site/versions/master/docs/skylark/errors/read-only-variable.md
index 4b1ecce..5dc1eee 100644
--- a/site/versions/master/docs/skylark/errors/read-only-variable.md
+++ b/site/versions/master/docs/skylark/errors/read-only-variable.md
@@ -1,4 +1,8 @@
-# Variable x is read only
+---
+layout: documentation
+title: Variable x is read only
+---
+# Error: Variable x is read only
A global variable cannot be reassigned. It will always point to the same object.
However, its content might change, if the value is mutable (for example, the