Update string-functions.md

jyf111 · web-flow · commit 8c012befcd90 · 2024-01-16T22:11:43.000+08:00
polish sentence
diff --git a/functions-and-operators/string-functions.md b/functions-and-operators/string-functions.md
@@ -170,7 +170,7 @@ This function is the same as the two-argument version of [`LOCATE(substr, str)`]
 
 > **Note:**
 >
-> `INSTR(str, substr)` is case sensitive since [TiDB uses binary collations by default](/character-set-and-collation.md), which differs from MySQL.
+> `INSTR(str, substr)` is case-sensitive by default, since [TiDB defaults to using binary collations](/character-set-and-collation.md), which differs from MySQL.
 
 - If either argument is a number, the function treats the number as a string.
 - If `substr` is not in `str`, the function returns 0; otherwise, it returns the index of the first occurrence

Original file line number	Diff line number	Diff line change
@@ -170,7 +170,7 @@ This function is the same as the two-argument version of [`LOCATE(substr, str)`]
`170`	`170`
`171`	`171`	`> Note:`
`172`	`172`	`>`
`173`		-> `INSTR(str, substr)` is case sensitive since [TiDB uses binary collations by default](/character-set-and-collation.md), which differs from MySQL.
	`173`	+> `INSTR(str, substr)` is case-sensitive by default, since [TiDB defaults to using binary collations](/character-set-and-collation.md), which differs from MySQL.
`174`	`174`
`175`	`175`	`- If either argument is a number, the function treats the number as a string.`
`176`	`176`	- If `substr` is not in `str`, the function returns 0; otherwise, it returns the index of the first occurrence