docs: fix approx_percentile_cont examples (#2090)

Signed-off-by: Dennis Zhuang <[email protected]>

Author: killme2008

docs/getting-started/quick-start.md

@@ -185,7 +185,7 @@ For example, you can use `approx_percentile_cont` to calculate the 95th percenti
 
 ```sql
 SELECT 
-  approx_percentile_cont(latency, 0.95) AS p95_latency, 
+  approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) AS p95_latency, 
   host
 FROM grpc_latencies
 WHERE ts >= '2024-07-11 20:00:10'
@@ -231,7 +231,7 @@ For example, to calculate the p95 latency of requests using a 5-second window:
 SELECT 
   ts, 
   host, 
-  approx_percentile_cont(latency, 0.95) RANGE '5s' AS p95_latency
+  approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) RANGE '5s' AS p95_latency
 FROM 
   grpc_latencies
 ALIGN '5s' FILL PREV;
@@ -266,7 +266,7 @@ WITH
     SELECT 
       ts, 
       host, 
-      approx_percentile_cont(latency, 0.95) RANGE '5s' AS p95_latency 
+      approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) RANGE '5s' AS p95_latency 
     FROM 
       grpc_latencies 
     ALIGN '5s' FILL PREV

docs/user-guide/query-data/cte.md

@@ -73,7 +73,7 @@ metrics AS (
     SELECT 
         ts, 
         host, 
-        approx_percentile_cont(latency, 0.95) RANGE '5s' AS p95_latency
+        approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) RANGE '5s' AS p95_latency
     FROM 
         grpc_latencies
     ALIGN '5s' FILL PREV
@@ -123,7 +123,7 @@ Output:
           SELECT 
             ts, 
             host, 
-            approx_percentile_cont(latency, 0.95) RANGE '5s' AS p95_latency
+            approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) RANGE '5s' AS p95_latency
           FROM 
             grpc_latencies
           ALIGN '5s' FILL PREV

i18n/zh/docusaurus-plugin-content-docs/current/getting-started/quick-start.md

@@ -183,7 +183,7 @@ SELECT *
 
 ```sql
 SELECT 
-  approx_percentile_cont(latency, 0.95) AS p95_latency, 
+  approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) AS p95_latency, 
   host
 FROM grpc_latencies
 WHERE ts >= '2024-07-11 20:00:10'
@@ -229,7 +229,7 @@ SELECT * FROM app_logs WHERE lower(log_msg) @@ 'timeout' AND ts > '2024-07-11 20
 SELECT 
   ts, 
   host, 
-  approx_percentile_cont(latency, 0.95) RANGE '5s' AS p95_latency
+  approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) RANGE '5s' AS p95_latency
 FROM 
   grpc_latencies
 ALIGN '5s' FILL PREV;
@@ -262,7 +262,7 @@ WITH
     SELECT 
       ts, 
       host, 
-      approx_percentile_cont(latency, 0.95) RANGE '5s' AS p95_latency 
+      approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) RANGE '5s' AS p95_latency 
     FROM 
       grpc_latencies 
     ALIGN '5s' FILL PREV

i18n/zh/docusaurus-plugin-content-docs/current/user-guide/query-data/cte.md

@@ -73,7 +73,7 @@ metrics AS (
     SELECT 
         ts, 
         host, 
-        approx_percentile_cont(latency, 0.95) RANGE '5s' AS p95_latency
+        approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) RANGE '5s' AS p95_latency
     FROM 
         grpc_latencies
     ALIGN '5s' FILL PREV
@@ -123,7 +123,7 @@ ORDER BY
           SELECT 
             ts, 
             host, 
-            approx_percentile_cont(latency, 0.95) RANGE '5s' AS p95_latency
+            approx_percentile_cont(0.95) WITHIN GROUP (ORDER BY latency) RANGE '5s' AS p95_latency
           FROM 
             grpc_latencies
           ALIGN '5s' FILL PREV