typo fix

Author: TennisBowling

README.md

@@ -31,12 +31,12 @@ Then the build may take a few minutes:
 git clone https://github.com/grandinetech/grandine
 cd grandine
 git submodule update --init dedicated_executor eth2_libp2p
-cargo build --compact --features default-networks
+cargo build --profile compact --features default-networks
 ```
 
 The compiled binary is available at `./target/compact/grandine`.
 
-For faster building (larger binary size) use `--release` instead of `--compact`.
+For faster building (larger binary size) use `--release` instead of `--profile compact`.
 
 ### Docker builds