validate browser configs (part 2)

[romainmenke]

• fill in blanks for op_mob and firefox_mob
• validate ios_saf versions
• use major.minor as the significant version for samsung_mob (same as safari)
• a few configs looked suspicious and have been fixed
• a few features shipped in safari in the past few months

more improvements to the lint config script with the final results looking like this :

### Browsers
- 83 missing
- 2 unknown
- 19 unbounded ('*' or '>5')

### Meta
- 27 missing docs link

### Log
- 4 warnings
- 2 info messages