Fix bazel command in codelab

Griffin caught this while doing the codelab

Signed-off-by: milind-u <milind.upadhyay@gmail.com>
Change-Id: I77d0b40eac3ba64affe58bb747676cf5e7ec6fa0
diff --git a/frc971/codelab/README.md b/frc971/codelab/README.md
index 8c25cac..962af02 100644
--- a/frc971/codelab/README.md
+++ b/frc971/codelab/README.md
@@ -24,7 +24,7 @@
 
 In order to run the tests, execute the following command in the terminal in the 971-Robot-Code folder:
 ```
-bazel run frc971/codelab:basic_test -- --gtest_color=yes
+bazel run //frc971/codelab:basic_test -- --gtest_color=yes
 ```
 
 In total, there are 7 tests, 3 of which will fail when you first run them. As each tests fails, it will print out the details of how each test result differed from the expected value. At the bottom, it will summarize the number of passed and failed tests.