doc: update design page for cpu templates

Signed-off-by: Nikita Kalyazin <[email protected]>

Author: kalyazin

docs/design.md

@@ -115,12 +115,10 @@ KVM supports.
 
 #### Exposing the CPU to the guest
 
-Firecracker allows the exposure of either the host processor information or any
-other family/model/stepping as a way to keep compatibility for services that
-were not running on top of it. In addition, Firecracker supports feature
-masking via CPUID. To simplify customer operation, CPU feature templates can be
-set via the Firecracker API. Currently, the available feature templates to
-choose from are EC2 C3 and EC2 T2 instance types.
+Firecracker allows control of what processor information is exposed
+to the guest by using [CPU templates](cpu_templates/cpu-templates.md).
+CPU templates can be set via the Firecracker API. Users can choose from
+existing static CPU templates and/or creating their own custom CPU templates.
 
 #### Clocksources available to guests