Fix grammar

Author: zohairawan

src/reflection.md

@@ -4,7 +4,7 @@ Reflection is what we call it when a program
 uses information about how it - the program - is structured
 in order to do things while running.
 
-We call it reflection because its as if your code
+We call it reflection because it's as if your code
 looks into a mirror and sees its own reflection.[^whenhumans]
 
 [^whenhumans]: When a human looks into a mirror they might see their own eye color.

src/reflection/class_objects.md

@@ -41,5 +41,5 @@ up front you should use a wildcard.
 
 [^ifconfused]: If that seems confusing and useless, you are half
 right. It certainly is confusing, but it is pretty useful sometimes.
-If its still beyond your ken just always write `Class<?>` and we'll
+If it's still beyond your ken just always write `Class<?>` and we'll
 loop back to it.