add missing code-fence language indicators + zap extraneous tabs

Signed-off-by: Phill Kelley <34226495+Paraphraser@users.noreply.github.com>

README.md

@@ -1761,7 +1761,7 @@ Another approach is to add the URL of your public key to your YubiKey:
 
 2. Construct the URL (based on [Shaw 2003](https://datatracker.ietf.org/doc/html/draft-shaw-openpgp-hkp-00)):
 
-	```
+	``` console
 	$ [[ ! "$KEYID" =~ ^"0x" ]] && KEYID="0x${KEYID}"
 	$ URL="hkps://keyserver.ubuntu.com:443/pks/lookup?op=get&search=${KEYID}"
 	$ echo $URL
@@ -1771,7 +1771,7 @@ Another approach is to add the URL of your public key to your YubiKey:
 3. Insert your YubiKey into a USB port.
 4. Add the URL to your YubiKey (will prompt for your YubiKey's admin PIN):
 
-	```
+	``` console
 	$ gpg --edit-card
 	gpg/card> admin
 	gpg/card> url
@@ -1789,7 +1789,7 @@ Once the URL of your public key is present on your YubiKey, setting up a new hos
 
 2. Use the `fetch` sub-command to retrieve your public key using the URL stored on the card:
 
-	```
+	``` console
 	$ gpg --edit-card
 	
 	gpg/card> fetch