update description and grammer

Author: Md Anam Raihan

ibm_catalog.json

@@ -112,7 +112,7 @@
               "value_constraints": [
                 {
                   "type": "regex",
-                  "description": "Prefix must begin with a lowercase letter and may contain only lowercase letters, digits, and hyphens '-'. It must not end with a hyphen('-'), and cannot contain consecutive hyphens ('--'). It should not exceed 16 characters",
+                  "description": "Prefix must begin with a lowercase letter and may contain only lowercase letters, digits, and hyphens '-'. It must not end with a hyphen('-'), and cannot contain consecutive hyphens ('--'). It should not exceed 16 characters.",
                   "value": "^$|^__NULL__$|^[a-z](?!.*--)(?:[a-z0-9-]{0,14}[a-z0-9])?$"
                 }
               ]
@@ -285,7 +285,7 @@
               "value_constraints": [
                 {
                   "type": "regex",
-                  "description": "The value provided for 'existing_cos_kms_key_crn' in not valid.",
+                  "description": "The value provided for 'existing_cos_kms_key_crn' is not valid.",
                   "value": "^__NULL__$|^crn:(.*:){3}(kms|hs-crypto):(.*:){2}[0-9a-fA-F]{8}(?:-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}:key:[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$"
                 }
               ]
@@ -295,7 +295,7 @@
               "value_constraints": [
                 {
                   "type": "regex",
-                  "description": "The value provided for 'existing_monitoring_crn' in not valid.",
+                  "description": "The value provided for 'existing_monitoring_crn' is not valid.",
                   "value": "^__NULL__$|^crn:(.*:){3}sysdig-monitor:(.*:){2}[0-9a-fA-F]{8}(?:-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}::$"
                 }
               ]

solutions/fully-configurable/variables.tf

@@ -31,7 +31,7 @@ variable "region" {
 variable "prefix" {
   type        = string
   nullable    = true
-  description = "The prefix to be added to all resources created by this solution. To skip using a prefix, set this value to null or an empty string. The prefix must begin with a lowercase letter and may contain only lowercase letters, digits, and hyphens '-'. It should not exceed 16 characters, must not end with a hyphen('-'), and can not contain consecutive hyphens ('--'). Example: at-0312. [Learn more](https://terraform-ibm-modules.github.io/documentation/#/prefix.md)."
+  description = "The prefix to add to all resources that this solution creates (e.g `prod`, `test`, `dev`). To skip using a prefix, set this value to null or an empty string. [Learn more](https://terraform-ibm-modules.github.io/documentation/#/prefix.md)."
 
   validation {
     # - null and empty string is allowed