fix: grammar in error message and docs (#5818)

Author: prql-bot

prqlc/prqlc/src/sql/gen_projection.rs

@@ -40,7 +40,7 @@ pub(super) fn try_into_exprs(
         if let Some(excluded) = excluded.get(&cid) {
             if !excluded.is_empty() {
                 return Err(
-                    Error::new_simple("Excluding columns not supported as this position")
+                    Error::new_simple("Excluding columns not supported in this position")
                         .with_span(span),
                 );
             }

prqlc/prqlc/tests/integration/sql.rs

@@ -4355,7 +4355,7 @@ fn test_group_all() {
         r###"
     from e=albums
     group !{genre_id} (aggregate {count this})
-        "###).unwrap_err(), @"Error: Excluding columns not supported as this position");
+        "###).unwrap_err(), @"Error: Excluding columns not supported in this position");
 }
 
 #[test]

web/book/src/reference/stdlib/transforms/sort.md

@@ -88,7 +88,7 @@ JOIN artists USING (artist_id)
 standard doesn't guarantee an order, although most implementations will respect
 it).
 
-<!-- We rolling this back. Waiting on the outcome of https://github.com/PRQL/prql/issues/2622 -->
+<!-- We're rolling this back. Waiting on the outcome of https://github.com/PRQL/prql/issues/2622 -->
 
 <!-- ## Nulls