update sd examples for 10.x behavior

[FoamyGuy]

Adds try/except for initializing the SD to account for new 10.x feature that the core will auto initialize it.

I tested the updated examples with both 9.2.8 and 10.0.0-alpha.6 on Metro RP2350

[FoamyGuy]

This is trying to resolve the same root issue as #3061, I didn't see that one was submitted until after I submitted this.

I think it would be best to use this try/except syntax so that we can have 1 code file that supports both 9.x and 10.x, rather than having two separate files with comments mentioning which file supports which versions. I think it will make it easier to document in the learn guide as well because we can have a single code embed that will work for both versions.

I can close this if we want to keep the different versions separated by different files instead though.

[TheKitty]

I think the code could use some more comments for clarity

[FoamyGuy]

The latest commits add more comments explaining the steps of the SD card init section of code and mention the 9.x / 10.x difference with auto mounting.

I also noticed one of these files mistakenly still contained a section of comment that was from the template this was created from and removed that.