docs: add context parameter to appendField, attachFile, clearField docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: DavertMik

docs/webapi/appendField.mustache

@@ -1,11 +1,16 @@
 Appends text to a input field or textarea.
 Field is located by name, label, CSS or XPath
 
+The third parameter is a context (CSS or XPath locator) to narrow the search.
+
 ```js
 I.appendField('#myTextField', 'appended');
 // typing secret
 I.appendField('password', secret('123456'));
+// within a context
+I.appendField('name', 'John', '.form-container');
 ```
 @param {CodeceptJS.LocatorOrString} field located by label|name|CSS|XPath|strict locator
 @param {string} value text value to append.
+@param {?CodeceptJS.LocatorOrString} [context=null] (optional, `null` by default) element located by CSS | XPath | strict locator.
 @returns {void} automatically synchronized promise through #recorder

docs/webapi/attachFile.mustache

@@ -2,11 +2,16 @@ Attaches a file to element located by label, name, CSS or XPath
 Path to file is relative current codecept directory (where codecept.conf.ts or codecept.conf.js is located).
 File will be uploaded to remote system (if tests are running remotely).
 
+The third parameter is a context (CSS or XPath locator) to narrow the search.
+
 ```js
 I.attachFile('Avatar', 'data/avatar.jpg');
 I.attachFile('form input[name=avatar]', 'data/avatar.jpg');
+// within a context
+I.attachFile('Avatar', 'data/avatar.jpg', '.form-container');
 ```
 
 @param {CodeceptJS.LocatorOrString} locator field located by label|name|CSS|XPath|strict locator.
 @param {string} pathToFile local file path relative to codecept.conf.ts or codecept.conf.js config file.
+@param {?CodeceptJS.LocatorOrString} [context=null] (optional, `null` by default) element located by CSS | XPath | strict locator.
 @returns {void} automatically synchronized promise through #recorder

docs/webapi/clearField.mustache

@@ -1,9 +1,14 @@
 Clears a `<textarea>` or text `<input>` element's value.
 
+The second parameter is a context (CSS or XPath locator) to narrow the search.
+
 ```js
 I.clearField('Email');
 I.clearField('user[email]');
 I.clearField('#email');
+// within a context
+I.clearField('Email', '.form-container');
 ```
 @param {LocatorOrString} editable field located by label|name|CSS|XPath|strict locator.
+@param {?CodeceptJS.LocatorOrString} [context=null] (optional, `null` by default) element located by CSS | XPath | strict locator.
 @returns {void} automatically synchronized promise through #recorder.