Update flex-css.md #482

[geoidesic]

As per comments from this issue:
#482

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• [ x ] Provided documentation update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• [ x ] No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• [ x ] It's submitted to the dev branch and not the master branch
• [ x ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• [ x ] It's been tested with all major browsers

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information: