Improve the `@GDScript.inverse_lerp()` documentation

This closes https://github.com/godotengine/godot-docs/issues/2589.

(cherry picked from commit 6b5573700b)

modules/gdscript/doc_classes/@GDScript.xml

@@ -490,9 +490,13 @@
 			<argument index="2" name="weight" type="float">
 			</argument>
 			<description>
-				Returns a normalized value considering the given range.
+				Returns a normalized value considering the given range. This is the opposite of [method lerp].
 				[codeblock]
-				inverse_lerp(3, 5, 4) # Returns 0.5
+				var middle = lerp(20, 30, 0.75)
+				# `middle` is now 27.5.
+				# Now, we pretend to have forgotten the original ratio and want to get it back.
+				var ratio = inverse_lerp(20, 30, 27.5)
+				# `ratio` is now 0.75.
 				[/codeblock]
 			</description>
 		</method>
@@ -567,7 +571,7 @@
 			<argument index="2" name="weight" type="float">
 			</argument>
 			<description>
-				Linearly interpolates between two values by a normalized value.
+				Linearly interpolates between two values by a normalized value. This is the opposite of [method inverse_lerp].
 				If the [code]from[/code] and [code]to[/code] arguments are of type [int] or [float], the return value is a [float].
 				If both are of the same vector type ([Vector2], [Vector3] or [Color]), the return value will be of the same type ([code]lerp[/code] then calls the vector type's [code]linear_interpolate[/code] method).
 				[codeblock]
@@ -587,7 +591,7 @@
 			</argument>
 			<description>
 				Linearly interpolates between two angles (in radians) by a normalized value.
-				Similar to [method lerp] but interpolate correctly when the angles wrap around [constant @GDScript.TAU].
+				Similar to [method lerp], but interpolates correctly when the angles wrap around [constant @GDScript.TAU].
 				[codeblock]
 				extends Sprite
 				var elapsed = 0.0