Fix spelling, variable names, improve docs

Suggestions from code review

Co-authored-by: NeroBurner <pyro4hell@gmail.com>

Author: dariusarnold

.devcontainer/Dockerfile

@@ -53,7 +53,7 @@ USER ubuntu
 # Section for interactive compilation during docker run
 
 WORKDIR /sources
-# Directory if InfiniTime source code
+# Directory of InfiniTime source code
 ENV INFINITIME_DIR="/sources/InfiniTime"
 # Passed to CMake generate step
 ENV GENERATE_ARGS=""
@@ -62,5 +62,5 @@ ENV BUILD_ARGS=""
 # Build directory
 ENV BUILD_DIRECTORY="build"
 
-CMD ["bash", "-c", "cmake -S . -B ${BUILD_DIRECTORY} -G Ninja -DInfiniTime_DIR=${INFINITIME_DIR} ${GENERATE_ARGS} \
+CMD ["bash", "-c", "cmake -S . -B ${BUILD_DIRECTORY} -G Ninja -DInfiniTime_DIR=${InfiniTime_DIR} ${GENERATE_ARGS} \
     && cmake --build ${BUILD_DIRECTORY} ${BUILD_ARGS}"]

README.md

@@ -124,7 +124,7 @@ Afterwards you can build the simulator with:
 docker run --rm -it -v ${PWD}:/sources infinisim-build
 ```
 
-By default this builds the InfiniTime from the submodule in your `${PWD}`.
+By default this builds the simulator using the InfiniTime files from the submodule in your `${PWD}`.
 If you want to use a different repository, you got to mount it and pass the path to the `INFINITIME_DIR` variable:
 ```sh
 docker run --rm -it -v ${PWD}:/sources -v ${PWD}/../InfiniTime:/infinitime -e INFINITIME_DIR=/infinitime infinisim-build