Fix typos (#389)

Found via `typos --format brief`

Author: kianmeng

lib/lograge/formatters/key_value.rb

@@ -21,7 +21,7 @@ def format(key, value)
 
       def parse_value(key, value)
         # Exactly preserve the previous output
-        # Parsing this can be ambigious if the error messages contains
+        # Parsing this can be ambiguous if the error messages contains
         # a single quote
         return "'#{value}'" if key == :error
         return Kernel.format('%.2f', value) if value.is_a? Float

lib/lograge/formatters/ltsv.rb

@@ -17,7 +17,7 @@ def fields_to_display(data)
       def format(key, value)
         if key == :error
           # Exactly preserve the previous output
-          # Parsing this can be ambigious if the error messages contains
+          # Parsing this can be ambiguous if the error messages contains
           # a single quote
           value = "'#{escape value}'"
         elsif value.is_a? Float