fixup! Use "source set" consistently in the guide

Co-authored-by: Filipp Zhinkin <[email protected]>

Author: Abduqodiri Qurbonzoda

README.md

@@ -428,7 +428,7 @@ Refer to our [comprehensive guide](docs/configuration-options.md) to learn about
 ### Separate source set for benchmarks
 
 Often you want to have benchmarks in the same project, but separated from main code, much like tests.
-Refer to our [detailed documentation](docs/separate-benchmark-source-set.md) on configuring your project to set up a separate source for benchmarks.
+Refer to our [detailed documentation](docs/separate-benchmark-source-set.md) on configuring your project to set up a separate source set for benchmarks.
 
 ## Examples