Fix various typos

Found via `codespell -q 3 -S ./thirdparty,*.po,./DONORS.md -L ackward,ang,ans,ba,beng,cas,childs,childrens,dof,doubleclick,expct,fave,findn,gird,hist,inh,inout,leapyear,lod,nd,numer,ois,ony,paket,ro,seeked,sinc,switchs,te,uint,varn,vew`

tests/core/math/test_math.cpp

@@ -308,7 +308,7 @@ public:
 						curly_stack++;
 						break;
 					} else {
-						break; //whathever else
+						break; //whatever else
 					}
 				}