Use code blocks in docs for code references

Author: jaaberg

docs/rules/no-access-state-in-setstate.md

@@ -1,6 +1,6 @@
 # Prevent using this.state within a this.setState (no-access-state-in-setstate)
 
-This rule should prevent usage of this.state inside setState calls.
+This rule should prevent usage of `this.state` inside setState calls.
 Such usage of this.state might result in errors when two state calls is
 called in batch and thus referencing old state and not the current
 state. An example can be an increment function:
@@ -11,7 +11,7 @@ function increment() {
 }
 ```
 
-If these two setState operations is grouped together in a batch it will
+If these two `setState` operations is grouped together in a batch it will
 look be something like the following, given that value is 1:
 
 ```