Fix typos (#2359)

docs/guides/how-to/create-a-custom-field.md

@@ -144,7 +144,7 @@ Then we follow the steps below:
   tracking interaction states etc.
 
 > N.B. Make sure you never override other property getters than the one mentioned in this tutorial,
-> because those properties will loose their reactivity (they won't be considered anymore in the
+> because those properties will lose their reactivity (they won't be considered anymore in the
 > update loop of LitElement).
 > Whenever a .modelValue/.formattedValue/.serializedValue needs to be computed, use
 > [parser/formatter/serializer](../../docs/../fundamentals/systems/form/formatting-and-parsing.md)
@@ -194,7 +194,7 @@ export const createAField = () => {
 That was all!
 Now that your .modelValue is connected your component is fully compatible with our form system
 
-> Is your `.modelValue` still undefined? Please make sure you're `.value` is of type 'string'.
+> Is your `.modelValue` still undefined? Please make sure your `.value` is of type 'string'.
 
 Now you can enhance your slider by writing custom Validators for it or by
 writing a parser to get a custom modelValue type.