fix: some styles, some sentences

Author: MC-XiaoHei

docs/.vitepress/theme/style/global.css

@@ -13,4 +13,13 @@
 
 .MathJax {
     overflow: hidden;
+}
+
+.DocSearch-Button .DocSearch-Button-Key {
+    border: none;
+}
+
+
+.DocSearch-Button .DocSearch-Button-Key + .DocSearch-Button-Key {
+    border: none;
 }

docs/en/dev-setup/setup.md

@@ -34,7 +34,7 @@ dependencies:
 
 :::
 
-## Using Build System (Recommended)
+## Using a build system (Recommended)
 
 :::info **Developer's Note:**
 

docs/en/user-setup/command-conversion/single-command-with-args.md

@@ -103,31 +103,31 @@ In the example above, we used the "range type" in the form `[0..10]`. This is a
 
 ::: tip Example – Declaring "range type" arguments
 
-To declare the range \\(10 \le x \le 50\\) (a value must be between 10 and 50 (inclusive)):
+To declare the range $0 \le x \le 50$ (a value must be between 10 and 50 (inclusive)):
 
 ```mccmd
 <name>[10..50]
 ```
 
-To declare the range \\(10 \le x\\) (a value must be bigger than or equal to 10):
+To declare the range $10 \le x$ (a value must be bigger than or equal to 10):
 
 ```mccmd
 <name>[10..]
 ```
 
-To declare the range \\(x \le 50\\) (a value must be less than or equal to 50):
+To declare the range $x \le 50$ (a value must be less than or equal to 50):
 
 ```mccmd
 <name>[..50]
 ```
 
-To declare the range \\(0 \le x \le 1\\), where \\(x\\) is a decimal value:
+To declare the range $0 \le x \le 1$, where $x$ is a decimal value:
 
 ```mccmd
 <name>[0.0..1.0]
 ```
 
-To declare a value \\(x\\) that can take any range of values and is a decimal number:
+To declare a value $x$ that can take any range of values and is a decimal number:
 
 ```mccmd
 <name>[brigadier:double]