Corrected a few spelling and formatting errors in the markdown files.

10 jobs for master in 121 minutes and 25 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #232177259
appimage:linux

00:11:18

passed #232177263
check-license-headers

00:01:39

passed #232177265
clangtidyfull:linux

01:59:06

passed #232177262
codeprotect

00:01:35

passed #232177261
allowed to fail
codequality

00:01:36

passed #232177258
inkscape:linux

00:13:17

passed #232177260
mac allowed to fail
inkscape:mac

00:12:52

passed #232177264
translations

00:02:34

 
  Test
passed #232177266
test:linux

00:02:17

 
  External
passed continuous-integration/appveyor/branch