Merge pull request #185 from BluntBlade/master

同步更新
Update vars.md
Merge pull request #186 from rwifeng/patch-12

Update vars.md
Update vars.md
Update put-policy.md
Update put-policy.md
Update put-policy.md
Update pfop.md
Update put-policy.md
魔法变量avinfo的具体描述
修改了魔法变量不支持的形式
Merge pull request #190 from forrest-mao/doc/java-sdk

魔法变量avinfo的具体描述
Merge pull request #187 from rwifeng/patch-13

Update vars.md
Merge pull request #188 from rwifeng/patch-14

Update put-policy.md
Merge pull request #189 from rwifeng/patch-15

Update pfop.md
Update pfop.md
Update put-policy.md
Merge pull request #191 from rwifeng/patch-16

Update pfop.md
Merge pull request #192 from rwifeng/patch-17

Update put-policy.md
shell sdk