fix typo and re-format sql (#4774)

This PR fixes a typo and re-formats the example SQL.

website/docs/docs/build/conversion-metrics.md

@@ -117,7 +117,7 @@ inner join (
     select *, uuid_string() as uuid from buys -- Adds a uuid column to uniquely identify the different rows
 ) b
 on
-v.user_id = b.user_id and v.ds <= b.ds and v.ds > b.ds - interval '7 day'
+v.user_id = b.user_id and v.ds <= b.ds and v.ds > b.ds - interval '7 days'
 ```
 
 The dataset returns the following (note that there are two potential conversion events for the first visit):
@@ -147,7 +147,6 @@ inner join (
 ) b
 on
 v.user_id = b.user_id and v.ds <= b.ds and v.ds > b.ds - interval '7 day'
-
 ```
 
 The dataset returns the following:
@@ -249,7 +248,7 @@ Use the following additional settings to customize your conversion metrics:
 To return zero in the final data set, you can set the value of a null conversion event to zero instead of null. You can add the `fill_nulls_with` parameter to your conversion metric definition like this:
 
 ```yaml
-- name: vist_to_buy_conversion_rate_7_day_window
+- name: visit_to_buy_conversion_rate_7_day_window
   description: "Conversion rate from viewing a page to making a purchase"
   type: conversion
   label: Visit to Seller Conversion Rate (7 day window)
@@ -345,7 +344,6 @@ on
   and v.ds <= buy_source.ds
   and v.ds > buy_source.ds - interval '7 day'
   and buy_source.product_id = v.product_id --Joining on the constant property product_id
-
 ```
 
 </TabItem>