Fix some typos

Signed-off-by: William Desportes <williamdes@wdes.fr>

doc/development/i18n/externalization.md

@@ -174,7 +174,7 @@ For example use `%{created_at}` in Ruby but `%{createdAt}` in JavaScript.
     # => When size == 2: 'There are 2 mice.'
     ```
 
-    Avoid using `%d` or count variables in sigular strings. This allows more natural translation in some languages.
+    Avoid using `%d` or count variables in singular strings. This allows more natural translation in some languages.
 
 - In JavaScript:
 
@@ -332,7 +332,7 @@ Errors in `locale/zh_HK/gitlab.po`:
     Syntax error in msgstr
     Syntax error in message_line
     There should be only whitespace until the end of line after the double quote character of a message text.
-    Parseing result before error: '{:msgid=>["", "You are going to remove %{project_name_with_namespace}.\\n", "Removed project CANNOT be restored!\\n", "Are you ABSOLUTELY sure?"]}'
+    Parsing result before error: '{:msgid=>["", "You are going to remove %{project_name_with_namespace}.\\n", "Removed project CANNOT be restored!\\n", "Are you ABSOLUTELY sure?"]}'
     SimplePoParser filtered backtrace: SimplePoParser::ParserError
 Errors in `locale/zh_TW/gitlab.po`:
   1 pipeline

doc/development/i18n/proofreader.md

@@ -130,7 +130,7 @@ are very appreciative of the work done by translators and proofreaders!
    your previous translations by [GitLab team members](https://about.gitlab.com/team/)
    or [Core team members](https://about.gitlab.com/core-team/) who are fluent in
    the language or current proofreaders.
-   - When a request is made for the first proofreader for a lanuguage and there are no [GitLab team members](https://about.gitlab.com/team/)
+   - When a request is made for the first proofreader for a language and there are no [GitLab team members](https://about.gitlab.com/team/)
    or [Core team members](https://about.gitlab.com/core-team/) who speak the language, we will request links to previous translation work in other communities or projects.  
 
 

doc/user/project/merge_requests/index.md

@@ -511,7 +511,7 @@ seconds and the status will update automatically.
 
 Merge Request pipeline statuses can't be retrieved when the following occurs:
 
-1. A Merge Requst is created
+1. A Merge Request is created
 1. The Merge Request is closed
 1. Changes are made in the project
 1. The Merge Request is reopened