update python and curl examples

Have `curl` examples use a $PDSHOST variable instead of hard-coding
https://bsky.social in the examples.

Use handle.example.com instead of example.com.

Use updated/current invocation of python SDK, which doesn't require
entryway URL.

docs/advanced-guides/posts.md

@@ -510,4 +510,4 @@ On Bluesky, each client fetches and embeds this card metadata, including blob up
 
 A complete script, with command-line argument parsing, is available [here](https://github.com/bluesky-social/cookbook/tree/main/python-bsky-post).
 
-We expect most folks will use SDKs or libraries for their programming language of choice to help with most of the details described here. But sometimes it is helpful to see what is actually going on behind the abstractions.
+We expect most folks will use SDKs or libraries for their programming language of choice to help with most of the details described here. But sometimes it is helpful to see what is actually going on behind the abstractions.

docs/get-started.mdx

@@ -46,16 +46,16 @@ Create an authentication session with your username and password.
       service: 'https://bsky.social'
     })
     await agent.login({
-      identifier: 'example.com',
+      identifier: 'handle.example.com',
       password: 'hunter2'
     })
     ```
   </TabItem>
   <TabItem value="curl" label="CURL">
-    Replace `$BLUESKY_HANDLE` and `$BLUESKY_PASSWORD` with your credentials.
+    Replace `$BLUESKY_HANDLE` and `$BLUESKY_PASSWORD` with your credentials, and `$PDSHOST` with your PDS host (including `https://`).
 
     ```bash
-    curl -X POST https://bsky.social/xrpc/com.atproto.server.createSession \
+    curl -X POST $PDSHOST/xrpc/com.atproto.server.createSession \
         -H "Content-Type: application/json" \
         -d '{"identifier": "'"$BLUESKY_HANDLE"'", "password": "'"$BLUESKY_PASSWORD"'"}'
     ```
@@ -64,8 +64,8 @@ Create an authentication session with your username and password.
       ```python
       from atproto import Client
 
-      client = Client(base_url='https://bsky.social')
-      client.login('example.com', 'hunter2')
+      client = Client()
+      client.login('handle.example.com', 'hunter2')
       ```
     </TabItem>
 </Tabs>
@@ -100,10 +100,10 @@ Now you can create a post by sending a POST request to the createRecord endpoint
     ```
   </TabItem>
   <TabItem value="curl" label="CURL">
-    Replace `$BLUESKY_HANDLE` with your handle and and `$ACCESS_JWT` with the JWT in the response from createSession.
+    Replace `$BLUESKY_HANDLE` with your handle, `$PDSHOST` with your PDS host (including `https://`), and and `$ACCESS_JWT` with the JWT in the response from createSession.
 
     ```bash
-    curl -X POST https://bsky.social/xrpc/com.atproto.repo.createRecord \
+    curl -X POST $PDSHOST/xrpc/com.atproto.repo.createRecord \
         -H "Authorization: Bearer $ACCESS_JWT" \
         -H "Content-Type: application/json" \
         -d "{\"repo\": \"$BLUESKY_HANDLE\", \"collection\": \"app.bsky.feed.post\", \"record\": {\"text\": \"Hello world! I posted this via the API.\", \"createdAt\": \"$(date -u +%Y-%m-%dT%H:%M:%SZ)\"}}"

docs/tutorials/creating-a-post.mdx

@@ -33,7 +33,7 @@ Each post requires these fields: `text` and `createdAt` (a timestamp).
       service: 'https://bsky.social'
     })
     await agent.login({
-      identifier: 'example.com',
+      identifier: 'handle.example.com',
       password: 'hunter2'
     })
 
@@ -58,8 +58,8 @@ Each post requires these fields: `text` and `createdAt` (a timestamp).
     ```python
     from atproto import Client
 
-    client = Client(base_url='https://bsky.social/xrpc')
-    client.login('example.com', 'hunter2')
+    client = Client()
+    client.login('handle.example.com', 'hunter2')
     post = client.send_post('Hello world! I posted this via the Python SDK.')
     ```