Fix a copy-pasta error

Change-Id: I2f7f7e98364f3f28245e5c379c7fe143c21d825b

docs/source/modeling_faqs.rst

diff --git a/docs/source/modeling_faqs.rst b/docs/source/modeling_faqs.rst
index 2e4f6f2..0d23de4 100644
--- a/docs/source/modeling_faqs.rst
+++ b/docs/source/modeling_faqs.rst
@@ -81,8 +81,7 @@
    and lower bounds constraints on the parameter blocks.
 
    The trick described above for dealing with inequality
-   constraints will **not** work.. default-domain:: cpp                                                                                                                  |
-                                        for equality constraints.
+   constraints will **not** work for equality constraints.
 
 #. How do I set one or more components of a parameter block constant?