Modify rule S6597: Update wording for LaYC (#3139)

rules/S6597/docker/rule.adoc

@@ -1,7 +1,7 @@
 == Why is this an issue?
 
-In single Dockerfile instructions like `RUN`, `CMD`, and `ENTRYPOINT` multiple commands can be run, including the `cd` command for changing directories.
-Using `WORKDIR` instead reduces the complexity of the above instructions and makes them easy to read, understand, troubleshoot, and maintain.
+In Dockerfile, instructions `RUN`, `CMD`, and `ENTRYPOINT` can contain long shell scripts chaining multiple commands, including the `cd` command for changing directories.
+Using `WORKDIR` instruction instead reduces the complexity of the above instructions and makes them easier to read, understand, troubleshoot, and maintain.
 
 === What is the potential impact?
 
@@ -16,9 +16,9 @@ RUN cd /tmp && \
   cd /app/bin
 ----
 
-In this example, the first `cd /tmp` command can be replaced by `WORKDIR cd /tmp` put above `RUN`.
-The last `cd /app/bin` command can be replaced too.
-The result will be following:
+In this example, the first `cd /tmp` command can be replaced by `WORKDIR /tmp` before `RUN`.
+The last `cd /app/bin` command can be replaced with `WORKDIR /app/bin` after the `RUN` instruction.
+The result will be the following:
 
 [source,docker]
 ----
@@ -32,19 +32,20 @@ WORKDIR /app/bin
 Those actions will reduce the length of the `RUN` instruction, which makes it easier to read and understand.
 Sometimes, it is hard to avoid the usage of `cd` command, especially in the middle of a long script.
 Removing them from the beginning and end of a multi-line is an easy improvement.
-Additionally, a lot of commands work well with absolute paths, so changing directories can be avoided in most cases.
+Additionally, many commands work well with absolute paths, so changing directories can be avoided in most cases.
 
 The `WORKDIR` instruction can be used multiple times in a Dockerfile.
 It changes the current directory for the next instructions and until there is a following change.
 This approach simplifies understanding of what is a current directory.
 
 The same principles apply to `CMD` and `ENTRYPOINT` instructions.
-Following this recommendation provides a clear structure for Dockerfiles, making it easier to maintain.
+
+This recommendation provides a clear structure for Dockerfiles, making it easier to maintain.
 
 == How to fix it
 
 Where possible, ensure that all usages of `cd` commands are replaced by a `WORKDIR` instruction.
-The `cd` commands at the beginning or end of multiline commands are a reliable sign, that they can be replaced.
+The `cd` commands at the beginning or end of a chain of commands are a reliable sign that they can be replaced.
 Also, using absolute paths can be considered for commands that accept them.
 
 === Code examples
@@ -60,8 +61,11 @@ RUN cd /app/bin && ./start.sh
 
 [source,docker,diff-id=1,diff-type=compliant]
 ----
-WORKDIR app/bin
+WORKDIR /app/bin
 RUN ./start.sh
+
+# Or:
+RUN /app/bin/start.sh
 ----
 
 == Resources