Fix typos

pages/2018-08-27-YAML-For-Nonprogrammers.md

@@ -253,7 +253,7 @@ Children:
 
 Things to note:
 
-- The space after the comma is important.
+- The space after the colon is important.
 - The value of `Hobbies` is a list. Like above, each line of the value is
   indented by an equal number of spaces.
 - The value of `Phones` is a dictionary. The same indentation rules apply.
@@ -401,7 +401,7 @@ Dictionaries can be merged using the merging operator: `<<`. For example:
 ```yaml
 a key: a value
 b key: b value
-<<: {d key: d value, e key: e value}
+<<: {c key: c value, d key: d value}
 ```
 
 will be parsed as