Apply suggestions from code review

Co-authored-by: Max Desiatov <max@desiatov.com>

Author: kateinoigakukun

Diff for: IntegrationTests/TestSuites/Sources/PrimaryTests/main.swift

@@ -216,7 +216,7 @@ try test("Closure Lifetime") {
             return .boolean(true)
         }
         try expectEqual(c1(), .boolean(true))
-        // second call will cause fatalError that can be catched as a JavaScript exception
+        // second call will cause `fatalError` that can be caught as a JavaScript exception
         _ = try expectThrow(try c1.throws())
         // OneshotClosure won't call fatalError even if it's deallocated before `release`
     }

Diff for: Sources/JavaScriptKit/FundamentalObjects/JSClosure.swift

@@ -2,7 +2,7 @@ import _CJavaScriptKit
 
 fileprivate var sharedFunctions: [JavaScriptHostFuncRef: ([JSValue]) -> JSValue] = [:]
 
-/// `JSOneshotClosure` is a JavaScript function that can be called at once.
+/// `JSOneshotClosure` is a JavaScript function that can be called only once.
 public class JSOneshotClosure: JSFunction {
     private var hostFuncRef: JavaScriptHostFuncRef = 0