docs: Correct line break details in book (#2872)

web/book/src/syntax/pipes.md

@@ -24,6 +24,16 @@ from employees | filter department == "Product" | select {first_name, last_name}
 
 A line-break doesn't create a pipeline in a couple of cases:
 
-- within a list (e.g. the `derive` examples below),
+- within a tuple
+- within an array
 - when the following line is a new statement, which starts with a keyword of
   `func`, `let` or `from`.
+
+```prql
+from [        # Line break OK in an array
+  {a=2, b=3}
+]
+derive {      # Line break OK in a tuple
+  c = 2 * a,
+}
+```

web/book/tests/documentation/snapshots/documentation__book__syntax__pipes__2.snap

@@ -0,0 +1,16 @@
+---
+source: web/book/tests/documentation/book.rs
+expression: "from [        # Line break OK in an array\n  {a=2, b=3}\n]\nderive {      # Line break OK in a tuple\n  c = 2 * a,\n}\n"
+---
+WITH table_0 AS (
+  SELECT
+    2 AS a,
+    3 AS b
+)
+SELECT
+  a,
+  b,
+  2 * a AS c
+FROM
+  table_0
+