Touchups to chapter 9

The only non-typo/grammar change to note is that we were referring to
String.split/2 but using String.split/1.
Merge pull request #302 from ernie/otp-chapter-9-touchups

Touchups to chapter 9
Update 8.markdown

I believe the variable should be client as mentioned in L41 to be consistent?
Merge pull request #303 from Ortuna/patch-1

Update 8.markdown