White-space characters in the copy-pasta box break some shells

[jmanero-r7]

The code-box with generated export ENVAR commands has some trailing white-space characters that break Bash due to slight variations in OS's clipboard semantics AFAIK. On OS X, copy-pasting both lines works as expected. However, on an Ubuntu/Unity desktop, I've observed this breaking the boto/python based aws-cli. Copy-pasting each line individually, being careful not to select past the last printable-character, fixes the issue.

[erran-r7]

@jmanero-r7 in #78 I use clipboard.js for selections. We could likely use it to add a copy button on that page as well. @rfennell-r7 pointed this out over my shoulder as well as seeing this issue in the backlog.