Update Installation.html (#23788)

* Update Installation.html

 There is no need for "--save", as the package will be added automatically to the dependencies since npm v5 five years ago, just for the sake of updating.

* Update Installation.html

* Update Installation.html

* Update Installation.html

* Update Installation.html

docs/manual/ar/introduction/Installation.html

@@ -34,7 +34,7 @@
 		</p>
 
 		<code>
-		npm install --save three
+		npm install three
 		</code>
 
 		<p>

docs/manual/en/introduction/Installation.html

@@ -28,7 +28,7 @@
 		</p>
 
 		<code>
-		npm install --save three
+		npm install three
 		</code>
 
 		<p>

docs/manual/ja/introduction/Installation.html

@@ -30,7 +30,7 @@
     </p>
 
     <code>
-		npm install --save three
+		npm install three
 		</code>
 
     <p>

docs/manual/ko/introduction/Installation.html

@@ -32,7 +32,7 @@
     </p>
 
     <code>
-		npm install --save three
+		npm install three
 		</code>
 
     <p>

docs/manual/zh/introduction/Installation.html

@@ -28,7 +28,7 @@
 		</p>
 
 		<code>
-		npm install --save three
+		npm install three
 		</code>
 
 		<p>