Remove MySQL mention in models comments

As MySQL is no longer supported we can omit
mentioning it in search method descriptions

app/finders/notes_finder.rb

@@ -148,7 +148,7 @@ class NotesFinder
 
   # Searches for notes matching the given query.
   #
-  # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+  # This method uses ILIKE on PostgreSQL.
   #
   def search(notes)
     query = @params[:search]

app/models/ci/runner.rb

@@ -163,14 +163,14 @@ module Ci
 
     # Searches for runners matching the given query.
     #
-    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    # This method uses ILIKE on PostgreSQL.
     #
     # This method performs a *partial* match on tokens, thus a query for "a"
     # will match any runner where the token contains the letter "a". As a result
     # you should *not* use this method for non-admin purposes as otherwise users
     # might be able to query a list of all runners.
     #
-    # query - The search query as a String
+    # query - The search query as a String.
     #
     # Returns an ActiveRecord::Relation.
     def self.search(query)

app/models/concerns/issuable.rb

@@ -195,7 +195,7 @@ module Issuable
   class_methods do
     # Searches for records with a matching title.
     #
-    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    # This method uses ILIKE on PostgreSQL.
     #
     # query - The search query as a String
     #
@@ -219,7 +219,7 @@ module Issuable
 
     # Searches for records with a matching title or description.
     #
-    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    # This method uses ILIKE on PostgreSQL.
     #
     # query - The search query as a String
     # matched_columns - Modify the scope of the query. 'title', 'description' or joining them with a comma.

app/models/label.rb

@@ -133,7 +133,7 @@ class Label < ApplicationRecord
 
   # Searches for labels with a matching title or description.
   #
-  # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+  # This method uses ILIKE on PostgreSQL.
   #
   # query - The search query as a String.
   #

app/models/namespace.rb

@@ -100,11 +100,11 @@ class Namespace < ApplicationRecord
 
     # Searches for namespaces matching the given query.
     #
-    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    # This method uses ILIKE on PostgreSQL.
     #
-    # query - The search query as a String
+    # query - The search query as a String.
     #
-    # Returns an ActiveRecord::Relation
+    # Returns an ActiveRecord::Relation.
     def search(query)
       fuzzy_search(query, [:name, :path])
     end

app/models/project.rb

@@ -617,8 +617,7 @@ class Project < ApplicationRecord
     # Searches for a list of projects based on the query given in `query`.
     #
     # On PostgreSQL this method uses "ILIKE" to perform a case-insensitive
-    # search. On MySQL a regular "LIKE" is used as it's already
-    # case-insensitive.
+    # search.
     #
     # query - The search query as a String.
     def search(query, include_namespace: false)

app/models/snippet.rb

@@ -337,7 +337,7 @@ class Snippet < ApplicationRecord
   class << self
     # Searches for snippets with a matching title, description or file name.
     #
-    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    # This method uses ILIKE on PostgreSQL.
     #
     # query - The search query as a String.
     #

app/models/user.rb

@@ -522,7 +522,7 @@ class User < ApplicationRecord
 
     # Searches users matching the given query.
     #
-    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    # This method uses ILIKE on PostgreSQL.
     #
     # query - The search query as a String
     #
@@ -565,7 +565,7 @@ class User < ApplicationRecord
 
     # searches user by given pattern
     # it compares name, email, username fields and user's secondary emails with given pattern
-    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    # This method uses ILIKE on PostgreSQL.
 
     def search_with_secondary_emails(query)
       return none if query.blank?