Update multi-tenancy document

docs/en/Multi-Tenancy.md

@@ -304,6 +304,7 @@ Volo.Abp.AspNetCore.MultiTenancy package adds following tenant resolvers to dete
 
 * **CurrentUserTenantResolveContributor**: Gets the tenant id from claims of the current user, if the current user has logged in. **This should always be the first contributor for security**.
 * **QueryStringTenantResolveContributor**: Tries to find current tenant id from query string parameter. Parameter name is "__tenant" by default.
+* **FormTenantResolveContributor**： Tries to find current tenant id from form parameter. Parameter name is "__tenant" by default.
 * **RouteTenantResolveContributor**: Tries to find current tenant id from route (URL path). Variable name is "__tenant" by default. So, if you defined a route with this variable, then it can determine the current tenant from the route.
 * **HeaderTenantResolveContributor**: Tries to find current tenant id from HTTP header. Header name is "__tenant" by default.
 * **CookieTenantResolveContributor**: Tries to find current tenant id from cookie values. Cookie name is "__tenant" by default.

docs/zh-Hans/Multi-Tenancy.md

@@ -305,6 +305,7 @@ Volo.Abp.AspNetCore.MultiTenancy 添加了下面这些租户解析器,从当前W
 
 * **CurrentUserTenantResolveContributor**: 如果当前用户已登录,从当前用户的声明中获取租户Id. **出于安全考虑,应该始终将其做为第一个Contributor**.
 * **QueryStringTenantResolveContributor**: 尝试从query string参数中获取当前租户,默认参数名为"__tenant".
+* **FormTenantResolveContributor**： 尝试从form参数中获取当前租户,默认参数名为"__tenant".
 * **RouteTenantResolveContributor**:尝试从当前路由中获取(URL路径),默认是变量名是"__tenant".所以,如果你的路由中定义了这个变量,就可以从路由中确定当前租户.
 * **HeaderTenantResolveContributor**: 尝试从HTTP header中获取当前租户,默认的header名称是"__tenant".
 * **CookieTenantResolveContributor**: 尝试从当前cookie中获取当前租户.默认的Cookie名称是"__tenant".