Update presentation/docker_workshop_1.html

Improved grammatical sense

presentation/docker_workshop_1.html

@@ -1096,7 +1096,7 @@ <h2> Deep Drive Into Dockerfile   </h2>
 <section>
  <p> Layer ID <br>
 
-Each instruction the Dockerfile generates a layer. Each of this layer has a randomly generated unique ID. This ID can be seen at the time of build. See the image next slide 
+Each instruction in the Dockerfile generates a layer. Each of this layer has a randomly generated unique ID. This ID can be seen at the time of build. See the image next slide 
 	</p> 
 </section>	
 <section>