Add quiet setting and fix typos in readme (#2549)

README.md

@@ -975,6 +975,7 @@ foo:
 | `fallback` | boolean | `false` | Search `justfile` in parent directory if the first recipe on the command line is not found. |
 | `ignore-comments` | boolean | `false` | Ignore recipe lines beginning with `#`. |
 | `positional-arguments` | boolean | `false` | Pass positional arguments. |
+| `quiet` | boolean | `false` | Disable echoing recipe lines before executing. |
 | `script-interpreter`<sup>1.33.0</sup> | `[COMMAND, ARGS…]` | `['sh', '-eu']` | Set command used to invoke recipes with empty `[script]` attribute. |
 | `shell` | `[COMMAND, ARGS…]` | - | Set command used to invoke recipes and evaluate backticks. |
 | `tempdir` | string | - | Create temporary directories in `tempdir` instead of the system default temporary directory. |
@@ -1029,7 +1030,7 @@ a := "foo"
 a := "bar"
 
 @foo:
-  echo $a
+  echo {{a}}
 ```
 
 ```console
@@ -3009,7 +3010,7 @@ foo:
 
 The other is to use a shebang recipe. Shebang recipe bodies are extracted and
 run as scripts, so a single shell instance will run the whole thing, and thus a
-`pwd` on one line will affect later lines, just like a shell script:
+`cd` on one line will affect later lines, just like a shell script:
 
 ```just
 foo: