Fix YAML parse errors in ecommerce catalog schema descriptions (#591)

Two description fields in the ecommerce_catalog_product schema used plain
scalars containing `: ` inside backtick-quoted code and `{}` JSON literals,
which the YAML parser mis-read as mapping entries. Converted both to literal
block scalars (`|`) to fix parse errors introduced in PR #587.

Author: harish-intercom

descriptions/0/api.intercom.io.yaml

@@ -33510,7 +33510,10 @@ components:
           nullable: true
         in_stock:
           type: boolean
-          description: Whether the product is available to purchase. If omitted, derived from variant stock — the product is in stock if at least one variant has `in_stock: true`. Products with no in-stock variants are hidden from Fin entirely and will not be recommended to shoppers.
+          description: |
+            Whether the product is available to purchase. If omitted, derived from variant stock — the
+            product is in stock if at least one variant has `in_stock: true`. Products with no in-stock
+            variants are hidden from Fin entirely and will not be recommended to shoppers.
           example: true
           nullable: true
         tags:
@@ -33552,7 +33555,11 @@ components:
           nullable: true
         available_options:
           type: array
-          description: Option types available for this product and their possible values (e.g. {"name": "Size", "values": ["S", "M", "L"]}). Fin uses these to understand what choices a shopper can make and to correctly filter variants when a shopper asks for a specific size, colour, or other attribute.
+          description: |
+            Option types available for this product and their possible values
+            (e.g. `{"name": "Size", "values": ["S", "M", "L"]}`). Fin uses these to understand what
+            choices a shopper can make and to correctly filter variants when a shopper asks for a
+            specific size, colour, or other attribute.
           items:
             type: object
             properties: