Fixed a typo. (Kotlin#3121)

Fixed a typo in the documentation of `GlobalScope`. Changed `coroutinesScope` to `coroutineScope`

Author: mikayelgr

kotlinx-coroutines-core/common/src/CoroutineScope.kt

@@ -178,7 +178,7 @@ public val CoroutineScope.isActive: Boolean
  * ```
  * // concurrently load configuration and data
  * suspend fun loadConfigurationAndData() {
- *     coroutinesScope {
+ *     coroutineScope {
  *         launch { loadConfiguration() }
  *         launch { loadData() }
  *     }