Minor contents logic changes for Kernels section; add a check for non-ascii (refs #4343)
Minor changes to provide better image alignment (refs #4343)
Correction needed for YAK (refs #4389)
Merge pull request #4391 from aeslaughter/training-4343

Small formatting changes in support of Kernels section
Merge pull request #4392 from aeslaughter/bug-4389

Correction needed for YAK
Merge commit 'f29f74247f93d55f11905f0343dfb4d3af2c88e3'