Lots of considerations for code snippet Usage information, and possible changes to behavior

[mbgower]

Rather than write out all the information I've previously captured in the comments of a PDF of the Code snippet Usage page, I thought I'd just attach it and make a high level list of considerations. These are additional to the the text updates in carbon-design-system/carbon-website#2837 and comments in #11110 (which are shown as resovled in my pdf comments)

• see if it's possible to detect the presence of a horizontal scrollbar for the single line snippets and only have the tabindex set on the snippet in that case
• the multi-line snippet requires the same horizontal scrollbar operability by keyboard as the single line snippet -- and could benefit from the same check for its presence
• remove hideCopyButton from the component
• confirm that either Show more or vertical scrollbars (or both?) are always present when the multi-line snippet exceeds the space AND that vertical scrolling by keyboard is possible
• tooltip for the inline snippet (on focus and hover)
  Code snippet usage.pdf
  code snippet style.pdf