Fix URL in get_flops documentation

Updated the link in the `get_flops` description to point to the correct URL.

Author: SohamJog

README.md

@@ -24,7 +24,7 @@ The `def.py` file is extended from the [problems class](https://github.com/tensa
 - `generate_test_cases`: returns a set of test cases that will be used to validate submissions.
 - `verify_result`: implement logic to check whether the output of a submission matches the expected result. This is flexible -- you can include comparisons for numerical values or verify algorithmically. 
 - `get_function_signature`: return argtypes based on [ctypes](https://docs.python.org/3/library/ctypes.html).
-- `get_flops`: get the number of FLOPs as a function of the testcase size. Relevant for [benchmarking submissions](https://tensara.org/blog/benchmarking-solutions).
+- `get_flops`: get the number of FLOPs as a function of the testcase size. Relevant for [benchmarking submissions](https://tensara.org/blog/benchmarking-solutions-6746465).
 TODO: Get generalized FLOP counting?
 - `get_extra_params`: (soon to be phased out) returns function parameters not used by `reference_solution`.