Fix examples documentation (#276)

* Fix typo

* Fix grammer

Author: rshah713

source/docs/examples/apriltag.rst

@@ -12,7 +12,7 @@ Knowledge and Equipment Needed
 - An open space with properly mounted 16h5 AprilTags
 - PhotonVision running on your laptop or a coprocessor
 
-This example will show you how to use AprilTags for full field robot localization using ``PhotonPoseEstimator``, ``AprilTagFieldLayout``, and the WPILib Pose Estimaton Classes.
+This example will show you how to use AprilTags for full field robot localization using ``PhotonPoseEstimator``, ``AprilTagFieldLayout``, and the WPILib Pose Estimation Classes.
 
 All PhotonVision specific code is in ``PhotonCameraWrapper.java`` and the relevant pose estimation parts are in ``DriveTrain.java.``
 

source/docs/examples/simposeest.rst

@@ -22,9 +22,9 @@ WPILib's :code:`Pose2d` class is used to represent robot positions on the field.
 
 Three different :code:`Pose2d` positions are relevant for this example:
 
-1) Desired Pose: The location the some autonomous routine wants the robot to be in.
+1) Desired Pose: The location some autonomous routine wants the robot to be in.
 2) Estimated Pose: The location the software `believes` the robot to be in, based on physics models and sensor feedback.
-3) Actual Pose: The locations he robot is actually at. The physics simulation generates this in simulation, but it cannot be directly measured on the real robot.
+3) Actual Pose: The locations the robot is actually at. The physics simulation generates this in simulation, but it cannot be directly measured on the real robot.
 
 Estimating Pose
 ^^^^^^^^^^^^^^^