ceresproblem label was incorrect

Change-Id: I3e210375adba4fa50ff3c25398b20a65d241cb35

docs/source/modeling.rst

diff --git a/docs/source/modeling.rst b/docs/source/modeling.rst
index 8a67e26..1083851 100644
--- a/docs/source/modeling.rst
+++ b/docs/source/modeling.rst
@@ -12,7 +12,7 @@
 of the form
 
 .. math:: \frac{1}{2}\sum_{i=1} \rho_i\left(\left\|f_i\left(x_{i_1}, ... ,x_{i_k}\right)\right\|^2\right).
-   :label: ceresproblem3
+   :label: ceresproblem
 
 The expression
 :math:`\rho_i\left(\left\|f_i\left(x_{i_1},...,x_{i_k}\right)\right\|^2\right)`
@@ -918,7 +918,7 @@
      problem.AddResidualBlock(new MyBinaryCostFunction(...), x2, x3);
 
    :func:`Problem::AddResidualBlock` as the name implies, adds a
-   residual block to the problem. It adds a :class:`CostFunction` , an
+   residual block to the problem. It adds a :class:`CostFunction`, an
    optional :class:`LossFunction` and connects the
    :class:`CostFunction` to a set of parameter block.