Update msgext-northwind-inventory-ts Labs Exercise 3 & 4

[daverupton]

Updated prompts in Exercise 3 to include the phrase "Northwind Inventory"

Added code change in Exercise 4 and fixed step numbering.

[BobGerman]

Thanks @daverupton - For the Ex. 3 changes, it should not be necessary to enter the entire plugin name in prompts; AFAIK it is a partial string match right now, so I don't think those changes should be necessary. Did you find the lab to not work without entering "Northwind Inventory" in its entirety?

The Ex 4 changes look right to me ... thanks! However I suggest backing out the Ex 3 changes...

[daverupton]

Thanks @daverupton - For the Ex. 3 changes, it should not be necessary to enter the entire plugin name in prompts; AFAIK it is a partial string match right now, so I don't think those changes should be necessary. Did you find the lab to not work without entering "Northwind Inventory" in its entirety?

The Ex 4 changes look right to me ... thanks! However I suggest backing out the Ex 3 changes...

@BobGerman - The prompts did not work without the additional "inventory" text added. I tried multiple times and all failed. As soon as I added the additional text, they worked.

[daverupton]

[garrytrinder]

@BobGerman are you happy for these changes to be merged?

[garrytrinder]

Just a note that if we change the instructions in the original Northwind sample, then we should ensure that we make the same changes across the different language versions that we have.

[garrytrinder]

Teams message extensions are no longer a recommended approach.

All samples were removed in #201 therefore we will not continue with reviewing this PR.