Minor improvements and fixes to this

blog/marlin-boot-animations.html

@@ -337,8 +337,9 @@
         <p><strong>Here's a breakdown of that.</strong></p>
         <h3 id="the-start">The start</h3>
         <ul>
-        <li><code>#pragma once</code>: I don't know what this does, but
-        it's in both animated and static boot screens.</li>
+        <li><code>#pragma once</code>: Just generic C/C++ stuff to make
+        sure the file is only included once, nothing interesting. (<a
+        href="https://en.wikipedia.org/wiki/Pragma_once">Wikipedia</a>)</li>
         <li><code>#define CUSTOM_BOOTSCREEN_ANIMATED</code>: Sets it to
         be an animated, not static, boot screen.</li>
         <li><code>define CUSTOM_BOOTSCREEN_TIMEOUT 0</code>: The extra
@@ -453,7 +454,8 @@
         decimal, unlike <a
         href="https://marlinfw.org/tools/u8glib/converter.html"><code>converter.html</code></a>
         would have generated. It's actually 3 frames (0.6 seconds) of
-        Bad Apple (albeit a bit messed up).</p>
+        Bad Apple (albeit a bit messed up for unknown reasons, but not
+        because I'm using <code>convert</code> instead).</p>
         <h3 id="the-end">The end</h3>
         <div class="sourceCode" id="cb3"><pre
         class="language-cpp"><code class="language-cpp"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#ifdef CUSTOM_BOOTSCREEN_ANIMATED_FRAME_TIME</span></span>
@@ -489,7 +491,7 @@
         <code>custom_start_bmp1</code>)</li>
         <li>Add the ending code.</li>
         </ol>
-        <h2 id="automatically">Automatically</h2>
+        <h3 id="automatically">Automatically</h3>
         <p>Note: This only allows for 5 FPS, no more, no less. However,
         I may edit <code>animator.py</code> to have an adjustable
         framerate.</p>

blog/marlin-boot-animations.md

@@ -328,7 +328,7 @@ const unsigned char custom_start_bmp1[] PROGMEM = {
 
 ### The start
 
-- `#pragma once`: I don't know what this does, but it's in both animated and static boot screens.
+- `#pragma once`: Just generic C/C++ stuff to make sure the file is only included once, nothing interesting. ([Wikipedia](https://en.wikipedia.org/wiki/Pragma_once))
 - `#define CUSTOM_BOOTSCREEN_ANIMATED`: Sets it to be an animated, not static, boot screen.
 - `define CUSTOM_BOOTSCREEN_TIMEOUT 0`: The extra time that the last frame is held for.
 - `#define CUSTOM_BOOTSCREEN_FRAME_TIME 200`: How many milliseconds each frame shows for. For a standard 128x64 display, 200ms is about as fast as it can go.
@@ -424,7 +424,7 @@ Which ends up looking like this:
 
 Rather than using Marlin's official converter, you can just take the array from the file generated by `convert frame.png frame.xmp`. Very useful for automation.
 
-Note that the earlier example was generated using `convert`, so it's in hexadecimal format rather than decimal, unlike [`converter.html`](https://marlinfw.org/tools/u8glib/converter.html) would have generated. It's actually 3 frames (0.6 seconds) of Bad Apple (albeit a bit messed up).
+Note that the earlier example was generated using `convert`, so it's in hexadecimal format rather than decimal, unlike [`converter.html`](https://marlinfw.org/tools/u8glib/converter.html) would have generated. It's actually 3 frames (0.6 seconds) of Bad Apple (albeit a bit messed up for unknown reasons, but not because I'm using `convert` instead).
 
 ### The end
 
@@ -457,7 +457,7 @@ If `CUSTOM_BOOTSCREEN_ANIMATED_FRAME_TIME` exists, the time for each frame is se
 2. Generate each frame's byte array using [`converter.html`](https://marlinfw.org/tools/u8glib/converter.html), then paste it into the file. Adjust the naming as needed (remember, it goes `custom_start_bmp`, `custom_start_bmp0`, `custom_start_bmp1`)
 3. Add the ending code.
 
-## Automatically
+### Automatically
 
 Note: This only allows for 5 FPS, no more, no less. However, I may edit `animator.py` to have an adjustable framerate.