Apply suggestions from code review

Co-authored-by: Jessica <[email protected]>

Author: bene2k1

pages/instances/troubleshooting/fix-unreachable-ipv6-rhel-based-instance.mdx

@@ -33,7 +33,7 @@ For general information on routed IPs and migration procedures, refer to our [ma
 
 ## Cause
 
-This issue is caused by a missing NetworkManager configuration for IPv6 address generation mode (`ipv6.addr-gen-mode=0`) on RHEL-based instances.
+This issue is caused by a missing NetworkManager configuration for IPv6 address generation mode (`ipv6.addr-gen-mode=0`) on RHEL-based Instances.
 
 ## Possible solution