Update README.md

tax_practical/README.md

@@ -311,7 +311,7 @@ We use [mOTUs2](https://github.com/motu-tool/mOTUs_v2) to create taxonomic profi
    ```
    cat test_sample.motus | grep -v "0.0000000000" | grep -c "meta_mOTU_"
    ```
-   and for meta-mOTUs:
+   and for ext-mOTUs:
    ```
    cat test_sample.motus | grep -v "0.0000000000" | grep -c "ext_mOTU_"
    ```