replace bad endpoint URL (copypasta?)

Swap to double quotes for basic example

Gemfile

@@ -7,7 +7,7 @@ gem 'middleman', '~> 4.5.0'
 gem 'middleman-autoprefixer', '~> 3.0.0'
 gem 'middleman-sprockets', '~> 4.1.1'
 gem 'middleman-syntax', '~> 3.2.0'
-gem 'nokogiri', '~> 1.18.3'
+gem 'nokogiri', '~> 1.18.8'
 gem 'rack', '~> 2.2.13'
 gem 'redcarpet', '~> 3.6.0'
 gem 'rouge', '~> 3.30.0'

Gemfile.lock

@@ -81,7 +81,7 @@ GEM
       rouge (~> 3.2)
     mini_portile2 (2.8.8)
     minitest (5.20.0)
-    nokogiri (1.18.3)
+    nokogiri (1.18.8)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     padrino-helpers (0.15.3)
@@ -127,7 +127,7 @@ DEPENDENCIES
   middleman-autoprefixer (~> 3.0.0)
   middleman-sprockets (~> 4.1.1)
   middleman-syntax (~> 3.2.0)
-  nokogiri (~> 1.18.3)
+  nokogiri (~> 1.18.8)
   rack (~> 2.2.13)
   redcarpet (~> 3.6.0)
   rouge (~> 3.30.0)

source/includes/http/_data.md.erb

@@ -14,8 +14,8 @@ Note that there are endpoints for submitting multiple data points to a feed, and
 > <div class="http"><span class="method-post">POST</span><code class="path">/api/v2/{username}/feeds/{feed_key}/data</code></div>
 
 ```shell
-# Send new data with a value of 42
-$ curl -F 'value=42' -H "X-AIO-Key: {io_key}" https://io.adafruit.com/api/v2/{username}/feeds/{feed_key}/data
+# Send new data with a value of 42 (note: using single quotes instead prevents variable expansion etc in bash)
+$ curl -F "value=42" -H "X-AIO-Key: {io_key}" https://io.adafruit.com/api/v2/{username}/feeds/{feed_key}/data
 
 # Send new data with a value of 42 and include optional location metadata
 curl -H "Content-Type: application/json" -d '{"value": 42, "lat": 23.1, "lon": "-73.3"}'  -H "X-AIO-Key: {io_key}" https://io.adafruit.com/api/v2/{username}/feeds/{feed_key}/data
@@ -655,8 +655,8 @@ Example for `group_feed_data` in the body is as follows: `{ feeds: [ { key: stri
 > <div class="http"><span class="method-get">GET</span><code class="path">/api/v2/{username}/groups/{group_key}/feeds/{feed_key}/data</code></div>
 
 ```shell
-# Send new data with a value of 42 to the group's feeds as json
-$ curl -H "X-AIO-Key: {io_key}" https://io.adafruit.com/api/v2/{username}/groups/{group_key}/data.json -d '{"feeds":[{"key":"{feed_key}","value":42}]}'
+# Get data from the given Feed in the given Group
+$ curl -H "X-AIO-Key: {io_key}" https://io.adafruit.com/api/v2/{username}/groups/{group_key}/feeds/{feed_key}/data
 ```
 
 ```python
@@ -767,4 +767,3 @@ feed_key | string | true | a valid feed key
 Parameter |   Type  |  Required |       Description
 --------- | ------- | --------- | -----------------------
 data | array | true | A collection of data records including `value` (required) and optionally including: `lat`, `lon`, `ele` (latitude, longitude, and elevation values), and `created_at` (a date/time string).
-