fix: Misc fixes

Author: dbrattli

chapters/AsyncProgramming.fs

@@ -7,7 +7,7 @@ Asynchronous programming is essential for modern applications - from web APIs to
 processing pipelines. F# offers two models for async code: `async` workflows and `task`
 expressions. Understanding when to use each is key to effective Fable.Python development.
 
-## Comparing Python and F`#` Async Models
+## Comparing Python and F# Async Models
 
 Python's async model is built on `asyncio`. Python coroutines are **cold** - calling an
 `async def` function returns a coroutine object that doesn't execute until awaited:
@@ -110,7 +110,7 @@ let catchExample () =
     }
 
 (**
-## F`#` Tasks
+## F# Tasks
 
 The `task` computation expression in .NET creates *hot* tasks that start immediately.
 However, when compiled to Python via Fable, tasks become Python coroutines - which are

chapters/Compatibility.fs

@@ -47,7 +47,7 @@ Most FSharp.Core operators are supported, including formatting with `sprintf`,
 |      F# Type      |           Python           |
 | ----------------- | -------------------------- |
 | `Tuple`           | `tuple`                    |
-| `Option<T>`       | erased to `T \| None`      |
+| `Option<T>`       | `T \| None` (erased)       |
 | `string`          | `str`                      |
 | `List<T>`         | `List.fs` (immutable list) |
 | `Map<K,V>`        | `Map.fs` (immutable map)   |

chapters/FableV5.fs

@@ -102,7 +102,7 @@ dotnet tool install fable --version 5.0.0-alpha.21
 dotnet add package Fable.Core --version 5.0.0-beta.4
 
 # Install the Python runtime
-uv add fable-library==5.0.0a17
+uv add fable-library==5.0.0a21
 ```
 
 Then compile your F# to Python:

chapters/FastAPI.fs

@@ -56,11 +56,11 @@ let app = FastAPI(title = "My API", version = "1.0.0")
 
 (**
 This generates:
+*)
 
-```python
-app = FastAPI(title="My API", version="1.0.0")
-```
+(*** include-python: app ***)
 
+(**
 The `app` variable name is important - the route decorators reference it.
 
 ## Defining Models

chapters/Python.fs

@@ -203,7 +203,7 @@ unwrap the option first.
 | Dictionary       | `{"a": 1}`          | `Map.ofList [("a", 1)]`   |
 | None check       | `if x is None:`     | `match x with None ->`    |
 | String format    | `f"Hello {name}"`   | `$"Hello {name}"`         |
-| Type annotation  | `x: int`            | `x: int32`.               |
+| Type annotation  | `x: int`            | `x: int32`                |
 | Comments         | `# comment`         | `// comment`              |
 | Multiline string | `"""text"""`        | `"""text"""` (same!)      |
 

chapters/Testing.fs

@@ -119,7 +119,7 @@ same API to Fable, supporting JavaScript, Python, and .NET.
 
 - **Composable**: Tests are values you can combine and transform
 - **No magic**: No reflection, no attributes - just functions
-- **Familiar F# idioms**: Uses computation expressions and pipelines
+- **Familiar F# idioms**: Uses lists and pipelines
 
 ### Setting Up Pyxpecto