Misc. capitalization/comment adjustments (#231)

The VirtualMachineInstance comment is not entirely true. It just
represents a single VM.

Sources/Containerization/VZVirtualMachineInstance.swift

@@ -53,7 +53,7 @@ struct VZVirtualMachineInstance: VirtualMachineInstance, Sendable {
         public var interfaces: [any Interface]
         /// Kernel image.
         public var kernel: Kernel?
-        /// The root Filesystem.
+        /// The root filesystem.
         public var initialFilesystem: Mount?
         /// File path to store the sandbox boot logs.
         public var bootlog: URL?

Sources/Containerization/VirtualMachineInstance.swift

@@ -25,7 +25,7 @@ public enum VirtualMachineInstanceState: Sendable {
     case unknown
 }
 
-/// A manager that can spawn and manage a virtual machine.
+/// A live instance of a virtual machine.
 public protocol VirtualMachineInstance: Sendable {
     associatedtype Agent: VirtualMachineAgent
 

Sources/cctl/RunCommand.swift

@@ -28,7 +28,7 @@ extension Application {
             abstract: "Run a container"
         )
 
-        @Option(name: [.customLong("image"), .customShort("i")], help: "image reference to base the container on")
+        @Option(name: [.customLong("image"), .customShort("i")], help: "Image reference to base the container on")
         var imageReference: String = "docker.io/library/alpine:3.16"
 
         @Option(name: .long, help: "id for the container")
@@ -43,16 +43,16 @@ extension Application {
         @Option(name: .customLong("fs-size"), help: "The size to create the block filesystem as")
         var fsSizeInMB: UInt64 = 2048
 
-        @Option(name: .customLong("mount"), help: "directory to share into the container (Example: /foo:/bar)")
+        @Option(name: .customLong("mount"), help: "Directory to share into the container (Example: /foo:/bar)")
         var mounts: [String] = []
 
-        @Option(name: .long, help: "ip address with subnet")
+        @Option(name: .long, help: "IP address with subnet")
         var ip: String?
 
-        @Option(name: .long, help: "gateway address")
+        @Option(name: .long, help: "Gateway address")
         var gateway: String?
 
-        @Option(name: .customLong("ns"), help: "nameserver addresses")
+        @Option(name: .customLong("ns"), help: "Nameserver addresses")
         var nameservers: [String] = []
 
         @Option(