update sysid plots (#1710)

Author: Oblarg

source/docs/software/pathplanning/system-identification/analyzing-data.rst

@@ -25,21 +25,11 @@ Click the dropdown arrow on the :guilabel:`Feedforward` Section.
 
 .. note:: If you would like to change units, you will have to press the :guilabel:`Override Units` button and fill out the information on the popup.
 
-.. image:: images/analyzing-data.png
+.. image:: images/feedback-analysis.png
    :alt: Analyzing data for feedforward
 
-By default, the analysis will be run by combining all the data in the test. For a finer-grained analysis, the analysis may be limited to a specific subset of data using the subset dropdown menu.
-
-.. image:: images/limiting-analysis-data.png
-   :alt: Limiting analysis data by using the subset dropdown
-
 The computed mechanism system parameters will then be displayed.
 
 .. image:: images/feedforward-values.png
    :alt: Analysis coefficient results
 
-There are also two accuracy metrics that are computed with this tool: r-squared and RMSE. The `r-squared <https://en.wikipedia.org/wiki/Coefficient_of_determination>`__ metric refers to the goodness of fit of the tool's `OLS (Ordinary Least Squares) fit <https://en.wikipedia.org/wiki/Ordinary_least_squares>`__. The `RMSE (Root Mean Squared Error) <https://en.wikipedia.org/wiki/Root-mean-square_deviation>`__ is the error (in the measured units) between the collected velocities and the predicted velocities from a simulation based on the feedforward gains.
-
-.. image:: images/viewing-metrics.png
-   :alt: Analysis accuracy metrics
-