Fix the reviewed comments

Author: kalaiyarasiganeshalingam

docs/proposals/extract_substring.md

@@ -10,8 +10,7 @@ _Issues_: [#2689](https://github.com/ballerina-platform/ballerina-standard-libra
 The Ballerina Regex module doesn't have any API to extract a substring/s from the given string by using regex. So, this proposal introduces new APIs to extract a substring/s from the given string using regex.
 
 ## Goals
-
-- Provide a way to extract a substring/s using regex.
+Provide a way to extract a substring/s using regex.
 
 ## Motivation
 As mentioned in the summary, at the moment, users have no way to extract a substring/s from the given string. But this is an important feature in string manipulation. So, this allows users to extract a substring/s easily by using Ballerina.
@@ -30,6 +29,7 @@ int startIndex;
 int endIndex;
 |};
 ```
+
 ```ballerina
 # Holds information about matched regex groups
 public type Groups readonly & object {

docs/proposals/update_replace_functions.md

@@ -10,25 +10,21 @@ _Issues_: [#2772](https://github.com/ballerina-platform/ballerina-standard-libra
 The existing replacement functions don't support the following functionalities:
 - There is no way to replace the matches from the particular string index of the given string.
 - There isn't any mechanism to replace the matches with a dynamic value.
-
 So, this proposal improves the replacement functions to support the above functionalities.
 
 ## Goals
-
-- Provide a way to support the above functionalities.
+Provide a way to support the above functionalities.
 
 ## Motivation
-
 This allows users to get the above functionalities when using replacement functions.
 
 ## Description
-
 API improvements are:
 
 - Introduce a function to create the new substring to be used to replace the matches. 
     ```ballerina
     # A function to be invoked to create the new substring to be used to replace the matches.
-    type ReplacerFunction function(Match 'match) returns string;
+    type ReplacerFunction function(Match matched) returns string;
     ```
 
 - Introduce a new type to get the replacement value.  
@@ -37,7 +33,7 @@ API improvements are:
     public type Replacement ReplacerFunction|string;
     ```
 
-- Change the 3rd param of the API with a new type.
+- Change the type of replacement param from string to `Replacement` type.
     ```ballerina
     # Replaces each occurrence of the substrings, which match the provided
     # regex from the given original string value with the
@@ -55,7 +51,7 @@ API improvements are:
     public isolated function replaceAll(string originalString, string regex, Replacement replacement) returns string;
     ```
 
-- Change the 3rd param of the API with a new type and introduce a new param `startIndex`.
+- Change the type of replacement param from string to `Replacement` type and introduce a new param `startIndex`.
     ```ballerina
     # Replaces the first substring that matches the given regex with
     # the provided replacement string or function.