Fix some typos on the page of "My extensions"

4 jobs for fixing-typos-in-my-extensions in 5 minutes and 6 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #9779
test:php

00:00:15

passed #9778
test:unit

00:01:54

 
  Build
passed #9780
build

00:01:29

 
  Layout
passed #9781
layout

00:01:42