fix formatting for examples

This is mostly just applying the existing clang format config, except:
- Use NOLINT on overlong comment lines.
- Wrap some sections in 'clang-format off' / 'clang format on'.
- Manually split or join some multi-line strings.

Change-Id: Ia1a40eeb92112e12c3a169309afe087af55b2f4f

examples/slam/pose_graph_2d/angle_local_parameterization.h

@@ -41,9 +41,9 @@ namespace examples {
 // [-pi to pi).
 class AngleLocalParameterization {
  public:
-
   template <typename T>
-  bool operator()(const T* theta_radians, const T* delta_theta_radians,
+  bool operator()(const T* theta_radians,
+                  const T* delta_theta_radians,
                   T* theta_radians_plus_delta) const {
     *theta_radians_plus_delta =
         NormalizeAngle(*theta_radians + *delta_theta_radians);
@@ -53,7 +53,8 @@ class AngleLocalParameterization {
 
   static ceres::LocalParameterization* Create() {
     return (new ceres::AutoDiffLocalParameterization<AngleLocalParameterization,
-                                                     1, 1>);
+                                                     1,
+                                                     1>);
   }
 };