fix: add docs

Author: sareyu

src/utils/yaMetrica.ts

@@ -1,5 +1,13 @@
 import {uiFactory} from '../uiFactory/uiFactory';
 
+/**
+ * Interface for a counter that provides methods for tracking metrics.
+ *
+ * @method hit - Tracks a hit event with optional arguments. https://yandex.ru/support/metrica/ru/objects/hit
+ * @method params - Sets parameters for the counter with optional arguments. https://yandex.ru/support/metrica/ru/objects/params-method
+ * @method userParams - Sets user-specific parameters for the counter with optional arguments. https://yandex.ru/support/metrica/ru/objects/user-params
+ * @method reachGoal - Tracks a goal achievement event with optional arguments. https://yandex.ru/support/metrica/ru/objects/reachgoal
+ */
 export interface Counter {
     hit: (...args: unknown[]) => void;
     params: (...args: unknown[]) => void;
@@ -9,6 +17,14 @@ export interface Counter {
 
 const yaMetricaMap = uiFactory.yaMetricaMap;
 
+/**
+ * A fake implementation of a counter metric for Yandex.Metrica.
+ * This class is used when the actual Yandex.Metrica counter is not defined,
+ * and it provides a warning message the first time any of its methods are called.
+ *
+ * @property name - The name of the counter.
+ * @property warnShown - Flag to indicate if the warning has been shown.
+ */
 class FakeMetrica implements Counter {
     name: string;
 
@@ -36,12 +52,19 @@ class FakeMetrica implements Counter {
 
     private warnOnce() {
         if (!this.warnShown) {
-            console.warn(`YaMetrica counter "${this.name}" is not defined\n`);
+            console.warn(`Yandex.Metrica counter "${this.name}" is not defined\n`);
             this.warnShown = true;
         }
     }
 }
 
+/**
+ * Retrieves a Yandex Metrica instance by name from the global window object.
+ * If no instance is found for the given name, returns a FakeMetrica instance instead.
+ *
+ * @param name The name of the metrica to retrieve
+ * @returns The Yandex Metrica instance if found, otherwise a FakeMetrica instance
+ */
 export function getMetrica(name: string) {
     const yaMetricaId = yaMetricaMap?.[name];
     const metricaInstance = yaMetricaId