Replace code-block with md syntax (#2940)

Superscedes #2939

Author: sciencewhiz

source/docs/software/commandbased/commands.rst

@@ -242,7 +242,9 @@ The ``startEnd`` factory, backed by the ``StartEndCommand`` ([Java](https://gith
     // Requires the drive subsystem
     {&m_drive}
   )
-    .. code-block:: python
+  ```
+
+  ```python
     commands2.cmd.functional_command(
       # Reset encoders on command start
       lambda: robot_drive.reset_encoders(),

source/docs/software/telemetry/persistent-alerts.rst

@@ -16,7 +16,7 @@ Alerts are created and managed using the ``Alert`` class. Typically, an alert sh
 Alert states are often expressed most easily as a conditional, such as whether the latest signal from a CAN device is up-to-date. In this case, we recommend calling the ``set`` method in a periodic loop and relying on the built-in change detection to activate the alert.
 
 .. tab-set-code::
-   .. code-block:: java
+   ```java
 
       class Robot {
         Alert alert = new Alert("Something went wrong", AlertType.kWarning);
@@ -25,8 +25,9 @@ Alert states are often expressed most easily as a conditional, such as whether t
           alert.set(...);
         }
       }
+   ```
 
-   .. code-block:: c++
+   ```c++
 
       class Robot {
         frc::Alert alert{"Something went wrong", frc::Alert::AlertType::kWarning};
@@ -35,14 +36,16 @@ Alert states are often expressed most easily as a conditional, such as whether t
       Robot::periodic() {
         alert.Set(...);
       }
+   ```
 
-   .. code-block:: python
+   ```python
 
       self.alert = Alert("Something went wrong", AlertType.kWarning)
 
       def periodic() {
         self.alert.set(...)
       }
+   ```
 
 .. note:: Suggested usage of each alert type (error, warning, or info) is provided in the enum API documentation.
 

source/docs/software/wpilib-tools/wpical/index.rst

@@ -104,7 +104,7 @@ There are a three things each calibration JSON needs:
 
 Example:
 
-.. code-block:: json
+```json
 
     {
         "avg_reprojection_error": 0.3989609373420966,
@@ -136,6 +136,7 @@ Example:
             0.0                         // ty
         ]
     }
+```
 
 ## Field Calibration
 After calibrating the camera, you can use the camera model to find the relative positions of the Apriltags. The calibration process will generate a WPILib field layout .json file and a .fmap for use on coprocessors and in robot code. WPIcal will prompt the user to specify a location to save the generated .json and .fmap field layouts to when the :guilabel:`Calibrate!!!` button is pressed.
@@ -167,8 +168,7 @@ WPIcal uses an "ideal" field map JSON as an initial guess point for the optimiza
 
 Example:
 
-.. code-block:: json
-
+```json
     {
         "ID": 1,
         "pose": {
@@ -187,6 +187,7 @@ Example:
             },
         },
     }
+```
 
 ### Select Field Calibration Directory
 WPIcal can calibrate a field based on one or more videos. All the calibration videos must be stored in their own directory, separate from any other files.