change ``bash headers to ``sh

data/sharing_secrets.md

@@ -7,7 +7,7 @@ You can share parts of a secret with multiple people, so only some of them need
 
 Install `ssss`, then decide on the total number of secrets (`N`), and the threshold of people who must share their shard of the secret in order to reveal the secret.
 
-```bash
+```sh
 N=5
 T=3
 FILE=secret.txt
@@ -17,7 +17,7 @@ Each shard is a line inside secret.txt.
 
 Check it's working:
 
-```bash
+```sh
 head -n $T $FILE | ssss-combine -t $T
 tail -n $T $FILE | ssss-combine -t $T
 ```