fix: minor issues in docs

README.md

@@ -14,4 +14,5 @@ Lintestor 是一个基于 Rust 的软件包可用性自动化测试系统，支
 ## 使用
 
 参见 [USAGE.md](USAGE.md).
+
 See [USAGE_en.md](USAGE_en.md) for English usage.

README_en.md

@@ -2,7 +2,7 @@
 
 [Docs](https://255doesnotexist.github.io/lintestor/) | [Release](about:blank) | [Summary](https://github.com/255doesnotexist/lintestor/blob/main/summary.md) | [Chinese README](README.md)
 
-`lintestor` is a framework for automated software package availability testing, tailored for RISC-V platforms, with (theoritical) multi-distribution support.
+`lintestor` is a framework for automated software package availability testing, tailored for RISC-V platforms, with (theoretical) multi-distribution support.
 
 ## Features
 
@@ -14,4 +14,5 @@
 ## Usage
 
 See [USAGE_en.md](USAGE_en.md).
+
 中文使用说明参见 [USAGE.md](USAGE.md).

USAGE_en.md

@@ -23,7 +23,7 @@ port = 2222
 username = "root"
 password = "root"
 ```
-Each subdirectory corresponding to a package should contain at least one test script (multiple scripts would be treated as multiple test cases). For writing the respective test scripts, Refer to existing ones under the `debian` folder to get you started.
+Each subdirectory corresponding to a package should contain at least one test script (multiple scripts would be treated as multiple test cases). For writing the respective test scripts, refer to existing ones under the `debian` folder to get you started.
 
 If certain commands need to be run globally prior each test script (eg. `export DEBIAN_FRONTEND=noninteractive` may be used on Debian-based systems to prevent apt interactive prompts), put them in `prerequisite.sh` under the distro directory. 
 
@@ -37,7 +37,7 @@ cargo run -- --test --aggr --summ
 
 A `report.json` report would be generated for each package under their respective subfolders. Now that the tests are done, check out the aggregated `reports.json` and the Markdown result matrix `summary.md` in the current directory.
 
-To toggle logging levels, set the `RUST_LOGS` environment variable to one of the following: debug, warn, info, error. `info` is the default logging level.
+To toggle logging levels, set the `RUST_LOG` environment variable to one of the following: debug, warn, info, error. `info` is the default logging level.
 ## Full CLI parameters
 
 ```sh