Clarify meaning of "certified"; add Librem 15 section

Closes QubesOS/qubes-issues#1902

hardware/certified-laptops.md

@@ -7,32 +7,33 @@ permalink: /doc/certified-laptops/
 Qubes-certified Laptops
 =======================
 
-Qubes-certified laptops are laptops that have been tested by the Qubes
-developers to ensure compatibility with all of Qubes' features. For more general
-information about choosing hardware for Qubes, please see the [System
-Requirements] and the [Hardware Compatibility List].
+Qubes-certified laptops are laptops that are regularly tested by the Qubes
+developers to ensure compatibility with all of Qubes' features. The developers
+test all new major versions and updates to ensure no regressions are introduced.
 
 We aim to partner with a few select computer makers to ensure that Qubes is
 compatible with them, so that new users have clear path towards getting started
 with Qubes if they desire. We aim for these makers to be as diverse as possible
 in terms of geography, cost, and availability.
 
-Note that we certify only that particular configuration is supported by Qubes
-OS. We take no responsibility for our partners' shipping process - including
+Note that we certify only that a particular configuration is supported by Qubes.
+We take no responsibility for our partners' shipping process -- including that
 the hardware will not being modified in any way (malicious or not).
 
+For more general information about choosing hardware for Qubes, please see the
+[System Requirements] and the [Hardware Compatibility List].
 
 Purism Librem 13
 ----------------
 
 [![image of Librem 13](/attachment/site/qubes-plus-purism.png)](https://puri.sm/librem-13/)
 
-For users now who seek to buy a Librem 13, there will be an option to have Qubes
+For users now who seek to buy a Librem 13, there is an option to have Qubes
 pre-installed on their Librem 13. This will include all the necessary tweaks for
 maximum compatibility with Qubes. 
 
 In addition, the Qubes team will receive a small portion of the revenue from any
-Librem 13 sale that come with Qubes pre-installed.
+Librem 13 sale that comes with Qubes pre-installed.
 
 For existing Librem 13 users, please follow the instructions to ensure maximum
 compatibility with Qubes:
@@ -45,6 +46,13 @@ compatibility with Qubes:
 
        sudo qubes-dom0-update --enablerepo=qubes-dom0-unstable kernel
 
+Purism Librem 15
+----------------
+
+While it is also currently possible to order a Librem 15 with Qubes
+pre-installed, the Librem 15 is not yet officially certified. However, testing
+is underway, and we expect to be able to certify it soon.
+
 
 [System Requirements]: /doc/system-requirements/
 [Hardware Compatibility List]: /hcl/