Update task.md

language in hints checked

memoryTrainerServer/memoryTrainerServerCardService/task.md

@@ -30,7 +30,7 @@ If you have any difficulties, **hints will help you solve this task**.
 
 ### Hints
 
-<div class="hint" title="Click me to learn about function definition of the SAM interfaces">
+<div class="hint" title="Click me to learn about defining a function for SAM interfaces">
 
 It is better to use a function definition for SAM interfaces:
 ```kotlin
@@ -40,9 +40,9 @@ val randomCardGenerator = CardSequenceGenerator {
 ```
 </div>
 
-<div class="hint" title="Click me to learn about the `map`built-in function">
+<div class="hint" title="Click me to learn about the `map` built-in function">
 
-You can use the built-in [`map`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/map.html) function to change each pair inside a map collection:
+You can use the built-in [`map`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/map.html) function to modify each pair in a map collection:
 
   ```kotlin
   val numbers = mapOf("one" to 1,"two" to 2, "three" to 3)
@@ -65,12 +65,12 @@ or use the built-in function [`shuffled`](https://kotlinlang.org/api/latest/jvm/
   ```
 </div>
 
-<div class="hint" title="Click me to learn about the main difference between mutable and readonly lists">
+<div class="hint" title="Click me to learn about the main difference between mutable and read-only lists">
 
 We'll go into the details of collections in the next module; for now, it is enough to know some basics facts:
-1) We can create read-only and mutable lists. 
+1) We can create both read-only and mutable lists. 
 If you initialize a read-only list, you can only read its elements. 
-If you create a mutable list, you can change the elements after list initialization:
+If you create a mutable list, you can modify its elements after list initialization:
 
 ```kotlin
 val readOnlyNumbers = listOf(1, 2, 3, 4, 5, 6)
@@ -93,7 +93,7 @@ println(readOnlyNumbers[2]) // OK
 
 <div class="hint" title="Click me to learn about the `isNotEmpty` built-in function">
 
-In case you need to check that a list is not empty, you can check its size or use the built-in [isNotEmpty](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/is-not-empty.html) function:
+In case you need to check that a list is not empty, you can either check its size or use the built-in [isNotEmpty](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/is-not-empty.html) function:
 
   ```kotlin
   val numbers = listOf(1, 2, 3)
@@ -113,7 +113,7 @@ It is the **same** as
 
 <div class="hint" title="Click me to learn about the `require` built-in function">
 
-To check some condition and throw an `IllegalArgumentException` error, you can use the built-in [`require`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/require.html) function:
+To check a certain condition and throw an `IllegalArgumentException` error if necessary, you can use the built-in [`require`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/require.html) function:
 
 ```kotlin
 fun foo(a: int) {
@@ -130,12 +130,12 @@ fun foo(a: int) {
     require (a >= 5) { "Some error message" }
 }
 ```
-Note, you need to use an _opposite_ condition!
+Note that you need to use an _opposite_ condition!
 </div>
 
 <div class="hint" title="Click me to learn about the `removeFirst` built-in function">
 
-If you need to get the first element from a mutable list and next remove it, you can use the built-in [`removeFirst`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/remove-first.html) function:
+If you need to get the first element from a mutable list and then remove it, you can use the built-in [`removeFirst`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/remove-first.html) function:
 
 ```kotlin
 fun main() {