修改笔误和翻译错误

这其中包含了[wyue99][1]指出的错误和在其指引下发现的错误。
wyue99提交的pull request在

* [https://github.com/wyue99/oracle_jrockit_the_definitive_guide/commit/5f20d0a82e2f3217afa3384fb4203a332b5b5632][1]
* [https://github.com/wyue99/oracle_jrockit_the_definitive_guide/commit/03a4d684490979b93fe80a36abb1189c976801c7][2]

[1]:    https://github.com/wyue99/oracle_jrockit_the_definitive_guide/commit/5f20d0a82e2f3217afa3384fb4203a332b5b5632
[2]:    https://github.com/wyue99/oracle_jrockit_the_definitive_guide/commit/03a4d684490979b93fe80a36abb1189c976801c7