#2119. Update assertion texts in Wildcards tests (#2981)

LanguageFeatures/Wildcards/super_parameters_A03_t01.dart

@@ -2,8 +2,9 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-/// @assertion Similarly to `this._` a `super._` does not introduce any
-/// identifier into the scope of the initializer list.
+/// @assertion Similarly to `this._`, and unlike for example `super.x`, a
+/// `super._` does not introduce any identifier into the scope of the
+/// initializer list.
 ///
 /// @description Checks that a `super._`  does not introduce any identifier into
 /// the scope of the initializer list.

LanguageFeatures/Wildcards/super_parameters_A03_t02.dart

@@ -2,8 +2,9 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-/// @assertion Similarly to `this._` a `super._` does not introduce any
-/// identifier into the scope of the initializer list.
+/// @assertion Similarly to `this._`, and unlike for example `super.x`, a
+/// `super._` does not introduce any identifier into the scope of the
+/// initializer list.
 ///
 /// @description Checks that a `super._`  does not introduce any identifier into
 /// the scope of the initializer list.

LanguageFeatures/Wildcards/wildcards_do_not_shadow_A01_t01.dart

@@ -14,7 +14,7 @@
 ///   }
 /// }
 /// ```
-// This program is valid and assigns to the field, not the local.
+/// This program is valid and assigns to the field, not the local.
 ///
 /// @description Checks that a local variable named `_` doesn't shadow a
 /// top-level variable named `_` but a class field does.

LanguageFeatures/Wildcards/wildcards_do_not_shadow_A01_t02.dart

@@ -14,7 +14,7 @@
 ///   }
 /// }
 /// ```
-// This program is valid and assigns to the field, not the local.
+/// This program is valid and assigns to the field, not the local.
 ///
 /// @description Checks that a local variable named `_` doesn't shadow a
 /// top-level getter named `_` but a class field does.

LanguageFeatures/Wildcards/wildcards_do_not_shadow_A01_t03.dart

@@ -14,7 +14,7 @@
 ///   }
 /// }
 /// ```
-// This program is valid and assigns to the field, not the local.
+/// This program is valid and assigns to the field, not the local.
 ///
 /// @description Checks that a local variable named `_` doesn't shadow a
 /// top-level function named `_` but a class field does.

LanguageFeatures/Wildcards/wildcards_do_not_shadow_A01_t04.dart

@@ -14,7 +14,7 @@
 ///   }
 /// }
 /// ```
-// This program is valid and assigns to the field, not the local.
+/// This program is valid and assigns to the field, not the local.
 ///
 /// @description Checks that a local variable named `_` doesn't shadow a
 /// top-level setter named `_` but a class field does.

LanguageFeatures/Wildcards/wildcards_do_not_shadow_A02_t01.dart

@@ -14,7 +14,7 @@
 ///   }
 /// }
 /// ```
-// This program is valid and assigns to the field, not the local.
+/// This program is valid and assigns to the field, not the local.
 ///
 /// @description Checks that a top-level variable named `_` can be assigned to
 /// a local variable named `_`.

LanguageFeatures/Wildcards/wildcards_do_not_shadow_A02_t02.dart

@@ -14,7 +14,7 @@
 ///   }
 /// }
 /// ```
-// This program is valid and assigns to the field, not the local.
+/// This program is valid and assigns to the field, not the local.
 ///
 /// @description Checks that a top-level function named `_` can be assigned to
 /// a local variable named `_`.

LanguageFeatures/Wildcards/wildcards_do_not_shadow_A02_t03.dart

@@ -14,7 +14,7 @@
 ///   }
 /// }
 /// ```
-// This program is valid and assigns to the field, not the local.
+/// This program is valid and assigns to the field, not the local.
 ///
 /// @description Checks that a type named `_` can be assigned to a local
 /// variable named `_`.