docs: Fix typos, add section to client architecture (#4897)

website/src/app/kb/architecture/critical-sequences/readme.mdx

@@ -14,8 +14,8 @@ especially critical to the integrity of the entire system:
 - [Policy evaluation](#policy-evaluation): Deciding whether to allow or deny a
   connection request.
 - [DNS resolution](#dns-resolution): Resolving DNS-based Resources.
-- [High availability](#high-availability): How Firezone achieves high avability
-  through load balancing and automatic failover.
+- [High availability](#high-availability): How Firezone achieves high
+  availability through load balancing and automatic failover.
 
 These will be explained in more detail below.
 

website/src/app/kb/architecture/tech-stack/readme.mdx

@@ -7,7 +7,7 @@ import Alert from "@/components/DocsAlert";
 # Architecture: Tech Stack
 
 Firezone has a unique mix of data throughput, reliability, and scability
-challenges. So we made sure to pick the right tools for the job. Here's a
+requirements. So we made sure to pick the right tools for the job. Here's a
 high-level overview of the tech stack choices we made and why.
 
 ## Control plane
@@ -20,7 +20,7 @@ Elixir and Phoenix.
 
 [Elixir](https://www.elixir-lang.org) is a functional programming language
 that's received lots of attention in recent years for its performance and
-scalability.
+concurrency properties.
 
 It's built on top of the [Erlang VM](https://www.erlang.org/), which has a
 reputation for being fault-tolerant and highly concurrent. Erlang continues to
@@ -72,6 +72,15 @@ Client applications:
   />
 </Link>
 
+The separation between control plane and data plane state serves two functions:
+
+- It ensures that control plane messages do not slow down or otherwise block the
+  data plane processing loop.
+- It allows the Client to withstand temporary network partitions from the
+  control plane API without dropping data plane packets. This means, for
+  example, existing connections to Resources continue to operate uninterrupted
+  even as we deploy new versions of the control plane API.
+
 ## Ops and infrastructure
 
 Firezone uses the following tools for ops and infrastructure:

website/src/components/Footer/index.tsx

@@ -175,12 +175,12 @@ export default function Footer() {
         </div>
         <div className="sm:flex sm:items-center sm:justify-start mt-4">
           <span className="text-xs">
-            WireGuard® is a registered trademark of Jason A. Donenfeld.
+            WireGuard is a registered trademark of Jason A. Donenfeld.
           </span>
         </div>
         <div className="sm:flex sm:items-center sm:justify-start lg:mt-2">
           <span className="text-xs">
-            Firezone<sup>™</sup> is a registered trademark of Firezone, Inc.
+            Firezone is a registered trademark of Firezone, Inc.
           </span>
         </div>
         <hr className="my-2 border-neutral-200 sm:mx-auto lg:mb-8 lg:mt-4" />