Minor corrections and documentation

[iksrandeb]

• Correct some spelling issues
• Remove unnecessary spaces and tabulations (4 spaces)
• Set executable flag on examples/bashbar2.sh file
• Update vumeter and progress documentation (copy paste error)
• Add short comments for example code
• Resolve path to tux.gif if run from different locations

[metal3d]

@Igor1201 already made a pass but I will try to resolve conflicts to apply yours.

You guys are wonderful, thanks for your help !