[Improvement](docs) refine query acceleration doc

apache · Dec 25, 2024 · 2996213 · 2996213
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diff --git a/docs/query-acceleration/tuning/tuning-plan/adjusting-join-shuffle.md b/docs/query-acceleration/tuning/tuning-plan/adjusting-join-shuffle.md
@@ -1,3 +1,4 @@
+---
 {
     "title": "Adjusting Join Shuffle Mode with Hint",
     "language": "en"
@@ -40,7 +41,7 @@ SELECT COUNT(*) FROM t2 JOIN [broadcast] t1 ON t1.c1 = t2.c2;
 SELECT COUNT(*) FROM t2 JOIN [shuffle] t1 ON t1.c1 = t2.c2;
 ```
 
-## Case Study
+## Case
 
 Next, we will demonstrate the usage of Distribute Hints through an example:
 

diff --git a/docs/query-acceleration/tuning/tuning-plan/controlling-hints-with-cbo-rule.md b/docs/query-acceleration/tuning/tuning-plan/controlling-hints-with-cbo-rule.md
@@ -51,7 +51,7 @@ Currently, the Doris optimizer supports several cost-based rewrites, which can b
 - PUSH_DOWN_AGG_THROUGH_JOIN_ONE_SIDE
 - PUSH_DOWN_DISTINCT_THROUGH_JOIN
 
-## Example
+## Case
 
 Here is a query example: