docs: Minor editorial tweaks (#5645)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: richb-hanover

web/book/src/reference/declarations/functions.md

@@ -19,10 +19,10 @@ from cities
 derive temp_c = (fahrenheit_to_celsius temp_f)
 ```
 
-This function is named `interp`, and has two positional parameters named `high`
-and `x`, and one named parameter named `low` which takes a default argument of
-`0`. It calculates the proportion of the distance that `x` is between `low` and
-`high`.
+The function below is named `interp`, and has two positional parameters named
+`high` and `x`, and one named parameter named `low` which takes a default
+argument of `0`. It calculates the proportion of the distance that `x` is
+between `low` and `high`.
 
 ```prql
 let interp = low:0 high x -> (x - low) / (high - low)

web/book/src/tutorial/aggregation.md

@@ -1,7 +1,7 @@
 # Aggregation
 
-A key feature of analytics is reducing many values down to some summary. This
-act is called "aggregation" and always includes a function — for example,
+A key feature of analytics is reducing many values down to a summary. This act
+is called "aggregation" and always includes a function — for example,
 `average` or `sum` — that reduces values in the table to a single row.
 
 ### `aggregate` transform

web/book/src/tutorial/filtering.md

@@ -57,6 +57,7 @@ We did something a bit odd at the end: first we took rows `11..20` and then took
 the first 3 rows from that result.
 
 > [!NOTE] Note that a single transform `take 11..13` would have produced the
-> same SQL. The example serves an example of how PRQL allows fast data
-> exploration by "stacking" transforms in the pipeline, reducing the cognitive
-> burden of how a new transform with the previous query.
+> same SQL. The example shows how PRQL allows fast data exploration by
+> "stacking" transforms in the pipeline. This reduces the cognitive burden:
+> unlike SQL, each new transform interacts _only_ with the results of the
+> previous query.

web/book/src/tutorial/relations.md

@@ -34,8 +34,8 @@ from invoices
 
 > [!NOTE] Try each of these examples here in the
 > [Playground.](https://prql-lang.org/playground/) Enter the query on the
-> left-hand side, and click **output.arrow** in the right-hand side to see the
-> result.
+> left-hand side, and click the **Query Results** tab on the right-hand side to
+> see the result.
 
 The result of the query above is not terribly interesting, it's just the same
 relation as before.