Proofread demo descriptions

Author: jserv

docs/demo.md

@@ -1,11 +1,12 @@
 # Demos
 
 ## Doom
-**source**: [doom_riscv](https://github.com/sysprog21/doom_riscv)
+**source**: [doom\_riscv](https://github.com/sysprog21/doom_riscv)
 
 **commmad**: `make doom`
 
-[Doom](https://en.wikipedia.org/wiki/Doom_(franchise)), a pioneering first-person shooter game developed by [id Software](https://en.wikipedia.org/wiki/Id_Software) in 1993, is known for its open-source code and vibrant community, it debuted innovations like genuine 3D graphics, networked multiplayer gameplay and the ability for players to create custom expansions. 
+[Doom](https://en.wikipedia.org/wiki/Doom_(franchise)), a pioneering first-person shooter game developed by [id Software](https://en.wikipedia.org/wiki/Id_Software) in 1993, is known for its open-source code and vibrant community.
+It debuted innovations like genuine 3D graphics, networked multiplayer gameplay and the ability for players to create custom expansions. 
 
 ![Doom Gameplay](https://imgur.com/bLc5LG8.gif)
 
@@ -18,24 +19,17 @@
 * 1: Fist
 * 3: Shotgun
 
-### Music and sound effect(sfx)
-Support music and sound effects.
+### Music and sound effect
+The music and sound effects are supported.
 
 ## Quake
 **source**: [quake-embedded](https://github.com/sysprog21/quake-embedded/)
 
 **command**: `make quake`
 
-[Quake](https://en.wikipedia.org/wiki/Quake_(series)) was created in 1996 as a successor of the highly successful first-person shooter game Doom, it is based on Doom's game engine and 3D graphics compatibility, and it enhanced the fast-paced gameplay and online multiplayer over the Internet. 
-
-Build Instruction:
-```shell
-git clone https://github.com/sysprog21/quake-embedded.git && cd quake-embedded
-mkdir build && cd build
-cmake -DCMAKE_TOOLCHAIN_FILE=../port/boards/rv32emu/toolchain.cmake \
-      -DCMAKE_BUILD_TYPE=RELEASE -DBOARD_NAME=rv32emu ..
-make
-```
+[Quake](https://en.wikipedia.org/wiki/Quake_(series)) was created in 1996 as a successor of the highly successful first-person shooter game Doom.
+It is built on the Doom game engine and offers 3D graphics compatibility.
+Moreover, it enhances fast-paced gameplay and supports online multiplayer over the Internet.
 
 ![Quake Gameplay](https://imgur.com/gXKb7D0.gif)
 
@@ -48,10 +42,11 @@ make
 * Switch Weapon: Slash(/) Key
 * Sprint: Shift Key
 
-You may use the mouse to adjust the pitch and yaw angle
+You may use the mouse to adjust the pitch and yaw angle.
 
-### Music and sound effect(sfx)
-Support sound effects but not music currently because Quake needs a CD-ROM and the extracted pak file doesn't contain any music or bgm-related files.
+### Music and sound effect
+Sound effects are supported, but music is currently unavailable in Quake because it requires a CD-ROM.
+The extracted pak file lacks any music or background music files.
 
 ### Limitations
 * Mouse wheel input is not supported