minor doc fixes
directly return default value on get
Merge pull request #4377 from twokul/minor-fixes

minor doc fixes
Merge pull request #4378 from g13013/fix_default

directly return default value on get
[BUGFIX beta] More descriptive error when setting read-only property
Merge pull request #4381 from jayphelps/patch-1

[BUGFIX beta]  More descriptive error when setting read-only property