docs: update 1.6 docs with Noel's feedback

I merged docs PR before receiving those updates.

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

website/content/v1.6/introduction/what-is-new/index.md

@@ -16,7 +16,7 @@ Users that need Linux firmware can pull them as an extension during install time
 If the initial boot requires firmware, a [custom ISO can be built]({{< relref "../../talos-guides/install/boot-assets" >}}) with the firmware included using the Image Factory service or using the `imager`.
 This also ensures that the linux-firmware is not tied to a specific Talos version.
 
-The list of firmware packages which are now available as extensions:
+The list of firmware packages which were removed from the default `initramfs` and are now available as extensions:
 
 * [bnx2 and bnx2x firmware (Broadcom NetXtreme II)](https://github.com/siderolabs/extensions/tree/main/firmware/bnx2-bnx2x)
 * [Intel ICE firmware (Intel(R) Ethernet Controller 800 Series)](https://github.com/siderolabs/extensions/tree/main/firmware/intel-ice-firmware)

website/content/v1.6/talos-guides/install/boot-assets.md

@@ -194,7 +194,7 @@ Also we want to disable predictable network interface names with `net.ifnames=0`
 First, let's lookup extension images for Intel CPU microcode updates and `gvisor` container runtime in the [extensions repository](https://github.com/siderolabs/extensions):
 
 ```shell
-$ crane export ghcr.io/siderolabs/extensions:{{< release >}} | tar x -O image-digests | egrep 'gvisor|intel-ucode'
+$ crane export ghcr.io/siderolabs/extensions:{{< release >}} | tar x -O image-digests | grep -E 'gvisor|intel-ucode'
 ghcr.io/siderolabs/gvisor:20231214.0-{{< release >}}@sha256:548b2b121611424f6b1b6cfb72a1669421ffaf2f1560911c324a546c7cee655e
 ghcr.io/siderolabs/intel-ucode:20231114@sha256:ea564094402b12a51045173c7523f276180d16af9c38755a894cf355d72c249d
 ```