docs: chaining filters

Author: jorwoods

docs/filter-sort.md

@@ -165,6 +165,9 @@ workbooks = workbooks.filter(project_name=project_name)
 # multiple filters can be added in a single line
 workbooks = workbooks.filter(project_name=project_name, owner_name=owner_name, size__gte=1000)
 
+# Multiple filters can be added through chaining.
+workbooks = workbooks.filter(project_name=project_name).filter(owner_name=owner_name).filter(size__gte=1000)
+
 # Find all views in a project, with a specific tag
 views = server.views.filter(project_name=project_name, tags="stale")