Fix a couple missed %%IMAGE%% conversions

couchdb/content.md

@@ -78,7 +78,7 @@ You can also use `couchdb` as the base image for your own couchdb instance and p
 Example Dockerfile:
 
 ```dockerfile
-FROM %%REPO%%
+FROM %%IMAGE%%
 
 COPY local.ini /usr/local/etc/couchdb/
 ```

openjdk/content.md

@@ -15,7 +15,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 The most straightforward way to use this image is to use a Java container as both the build and runtime environment. In your `Dockerfile`, writing something along the lines of the following will compile and run your project:
 
 ```dockerfile
-FROM %%REPO%%:7
+FROM %%IMAGE%%:7
 COPY . /usr/src/myapp
 WORKDIR /usr/src/myapp
 RUN javac Main.java