IE10 and IE11 do not properly support the use of margin-auto on flex parents with a justify-content value other than flex-start. This PR removes the examples showcasing those two classes at play together in favor of simpler ones with just the margin-auto utilities.
More details can be found at https://stackoverflow.com/a/37535548, which has been linked to from the docs as well.
Closes #24319 (closed) and closes #24413 (closed).