Add explanation

Author: furtib

src/codechecker_script.py

@@ -32,6 +32,11 @@
     r"\/sandbox\/processwrapper-sandbox\/\S*\/execroot\/": "/execroot/",
     START_PATH + r"\/worker\/build\/[0-9a-fA-F]{16}\/root\/": "",
     START_PATH + r"\/[0-9a-fA-F]{32}\/execroot\/": "",
+    # The path getting into the plist file on a docker img is:
+    # bazel_codechecker/bazel-out/k8-fastbuild/...
+    # But on regular other system its:
+    # /home/.../execroot/bazel_codechecker/bazel-out/k8-fastbuild/...
+    # This is because normally the runner is not the root user
     r"<string>bazel_codechecker\/": "<string>",
 }