Fix a couple of typos. (#654)

jenkins/content.md

@@ -84,7 +84,7 @@ docker run --name myjenkins -p 8080:8080 -p 50000:50000 --env JAVA_OPTS="-Djava.
 
 # Passing Jenkins launcher parameters
 
-Argument you pass to docker running the jenkins image are passed to jenkins launcher, so you can run for sample :
+Arguments you pass to docker running the jenkins image are passed to jenkins launcher, so you can run for example :
 
 ```console
 $ docker run jenkins --version
@@ -92,7 +92,7 @@ $ docker run jenkins --version
 
 This will dump Jenkins version, just like when you run jenkins as an executable war.
 
-You also can define jenkins arguments as `JENKINS_OPTS`. This is usefull to define a set of arguments to pass to jenkins launcher as you define a derived jenkins image based on the official one with some customized settings. The following sample Dockerfile uses this option to force use of HTTPS with a certificate included in the image
+You also can define jenkins arguments as `JENKINS_OPTS`. This is useful to define a set of arguments to pass to jenkins launcher as you define a derived jenkins image based on the official one with some customized settings. The following sample Dockerfile uses this option to force use of HTTPS with a certificate included in the image
 
 ```console
 FROM jenkins:1.565.3