[microTVM] Zephyr: Fix option name in PROJECT_OPTIONS (#8884)

Fix option name for using an extra tarball when creating a new project
directory: it should read 'extra_files_tar', not 'extra_files'.

This commit also removes the implicit C-style string concatenation in
the help strings for options 'nrfjprog_snr' and 'openocd_serial'. It
also adds a period at the end of some help strings, because some are
missing it plus help strings in TVMC use that form.

Signed-off-by: Gustavo Romero <gustavo.romero@linaro.org>

apps/microtvm/zephyr/template_project/microtvm_api_server.py

@@ -215,28 +215,26 @@ def _get_nrf_device_args(options):
 
 PROJECT_OPTIONS = [
     server.ProjectOption(
-        "extra_files",
-        help="If given, during generate_project, uncompress the tarball at this path into the project dir",
+        "extra_files_tar",
+        help="If given, during generate_project, uncompress the tarball at this path into the project dir.",
     ),
     server.ProjectOption(
-        "gdbserver_port", help=("If given, port number to use when running the local gdbserver")
+        "gdbserver_port", help=("If given, port number to use when running the local gdbserver.")
     ),
     server.ProjectOption(
         "nrfjprog_snr",
-        help=(
-            "When used with nRF targets, serial # of the " "attached board to use, from nrfjprog"
-        ),
+        help=("When used with nRF targets, serial # of the attached board to use, from nrfjprog."),
     ),
     server.ProjectOption(
         "openocd_serial",
-        help=("When used with OpenOCD targets, serial # of the " "attached board to use"),
+        help=("When used with OpenOCD targets, serial # of the attached board to use."),
     ),
     server.ProjectOption(
         "project_type",
         help="Type of project to generate.",
         choices=tuple(PROJECT_TYPES),
     ),
-    server.ProjectOption("verbose", help="Run build with verbose output"),
+    server.ProjectOption("verbose", help="Run build with verbose output."),
     server.ProjectOption(
         "west_cmd",
         help=(
@@ -245,7 +243,7 @@ def _get_nrf_device_args(options):
         ),
     ),
     server.ProjectOption("zephyr_base", help="Path to the zephyr base directory."),
-    server.ProjectOption("zephyr_board", help="Name of the Zephyr board to build for"),
+    server.ProjectOption("zephyr_board", help="Name of the Zephyr board to build for."),
 ]