Minor fixes

1. Typo in c_api.h
2. The stream operator for FunctionSample is now in the ceres::internal namespace.

Change-Id: Id927a7a49c47d8903505535749ecca78cd2e83b3

include/ceres/c_api.h

@@ -47,8 +47,9 @@ void ceres_init();
 
 /* Equivalent to CostFunction::Evaluate() in the C++ API.
  *
- * The user is may keep private information inside the opaque user_data object.
- * The pointer here is the same one passed in the ceres_add_residual_block(). */
+ * The user may keep private information inside the opaque user_data object.
+ * The pointer here is the same one passed in the ceres_add_residual_block().
+ */
 typedef int (*ceres_cost_function_t)(void* user_data,
                                      double** parameters,
                                      double* residuals,

internal/ceres/line_search.cc

@@ -62,6 +62,8 @@ FunctionSample ValueAndGradientSample(const double x,
   return sample;
 };
 
+}  // namespace
+
 // Convenience stream operator for pushing FunctionSamples into log messages.
 std::ostream& operator<<(std::ostream &os,
                          const FunctionSample& sample) {
@@ -72,8 +74,6 @@ std::ostream& operator<<(std::ostream &os,
   return os;
 };
 
-}  // namespace
-
 LineSearch::LineSearch(const LineSearch::Options& options)
     : options_(options) {}