Fix grammatical errors (#713)

Author: minhsun-c

README.md

@@ -111,7 +111,7 @@ Build with a larger `INITRD_SIZE` (e.g., 64 MiB) to run SDL-oriented application
 ```shell
 $ make system ENABLE_SYSTEM=1 ENABLE_SDL=1 INITRD_SIZE=64
 ```
-Once login the guestOS, run `doom-riscv` or `quake` or `smolnes`. To terminate SDL-oriented applications, use the built-in exit utility, ctrl-c or the SDL window close button(X).
+Once log into the guestOS, run `doom-riscv` or `quake` or `smolnes`. To terminate SDL-oriented applications, use the built-in exit utility, ctrl-c or the SDL window close button(X).
 
 #### Virtio Block Device (optional)
 Generate ext4 image file for virtio block device in Unix-like system:
@@ -471,10 +471,10 @@ Thus, the target system should have the Emscripten version 3.1.51 installed.
 
 Moreover, `rv32emu` leverages the tail call optimization (TCO) and we have tested the WebAssembly
 execution in Chrome with at least MAJOR 112, Firefox with at least MAJOR 121 and Safari with at least version 18.2
-since they supports tail call feature. Please check your browser version and update if necessary, or install a compatible
+since they support tail call feature. Please check your browser version and update if necessary, or install a compatible
 browser before proceeding.
 
-Source your Emscripten SDK environment before make. For macOS and Linux user:
+Source your Emscripten SDK environment before make. For macOS and Linux users:
 ```shell
 $ source ~/emsdk/emsdk_env.sh
 ```