fix typos

Author: andrewwinters5000

AUTHORS.md

@@ -1,5 +1,5 @@
 TrixiBottomTopography.jl's development was initiated by Maximilian D. Bertrand.
-It's development and maintenance is coordinated by a group of *principal developers*,
+Its development and maintenance is coordinated by a group of *principal developers*,
 who are also its main contributors and who can be contacted in case of
 questions about TrixiBottomTopography.jl. In addition, there are *contributors* who have
 provided substantial additions or modifications. Together, these two groups form

CODE_OF_CONDUCT.md

@@ -60,8 +60,7 @@ representative at an online or offline event.
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
 reported to
-[Michael Schlottke-Lakemper](mailto:michael.schlottke-lakemper@uni-a.de),
-[Hendrik Ranocha](mailto:mail@ranocha.de),
+[Andrew Winters](mailto:andrew.ross.winters@liu.se),
 or any other of the principal developers responsible for enforcement listed in
 [AUTHORS.md](AUTHORS.md).
 All complaints will be reviewed and investigated promptly and fairly.