a couple grammar fixes (#3259)

Author: GameRoMan

Sources/NIOCore/EventLoopFuture.swift

@@ -899,7 +899,7 @@ extension EventLoopFuture {
 
     /// Internal: Set the value and return a list of callbacks that should be invoked as a result.
     ///
-    /// We need a seperate method for setting the error to avoid Sendable checking of `Value`
+    /// We need a separate method for setting the error to avoid Sendable checking of `Value`
     @inlinable
     internal func _setError(_ error: Error) -> CallbackList {
         self.eventLoop.assertInEventLoop()

Sources/NIOPerformanceTester/UDPBenchmark.swift

@@ -127,7 +127,7 @@ extension UDPBenchmark {
                     /// Number of requests still to send.
                     var requestsToSend: Int
                     /// Number of responses still being waited for.
-                    var responsesToRecieve: Int
+                    var responsesToReceive: Int
                     /// Number of writes before the next flush, i.e. flush on zero.
                     var writesBeforeNextFlush: Int
                     /// Number of writes before each flush.
@@ -137,7 +137,7 @@ extension UDPBenchmark {
 
                     init(requests: Int, writesPerFlush: Int, promise: EventLoopPromise<Void>) {
                         self.requestsToSend = requests
-                        self.responsesToRecieve = requests
+                        self.responsesToReceive = requests
                         self.writesBeforeNextFlush = writesPerFlush
                         self.writesPerFlush = writesPerFlush
                         self.promise = promise
@@ -169,8 +169,8 @@ extension UDPBenchmark {
             mutating func receive() -> Receive {
                 switch self.state {
                 case .running(var running):
-                    running.responsesToRecieve &-= 1
-                    if running.responsesToRecieve == 0, running.requestsToSend == 0 {
+                    running.responsesToReceive &-= 1
+                    if running.responsesToReceive == 0, running.requestsToSend == 0 {
                         self.state = .stopped
                         return .finished(running.promise)
                     } else {

Tests/NIOPosixTests/ChannelTests.swift

@@ -1660,7 +1660,7 @@ final class ChannelTests: XCTestCase {
         // this should escalate to a full closure of the clientChannel.
         XCTAssertNoThrow(try clientChannel.close(mode: .output).wait())
 
-        // Assert that full closure of client channel occured by verifying
+        // Assert that full closure of client channel occurred by verifying
         // that channelInactive was invoked on the channel.
         XCTAssertNoThrow(try clientChannelInactivePromise.futureResult.wait())