Minor markdown fixes

Author: Wilfred

manual/src/diffing.md

@@ -49,7 +49,6 @@ From the start vertex, we have two options:
 +---------------------+  +---------------------+
 ```
 
-
 Choosing "novel atom R" to vertex 2 will turn out to be the best
 choice. From vertex 2, we can see three routes to the end vertex.
 

manual/src/installation.md

@@ -4,8 +4,12 @@ Difftastic can be installed as pre-built binaries or using various package manag
 
 ## Pre-Built Binaries
 
-Difftastic releases are published as [GitHub releases](https://github.com/Wilfred/difftastic/releases) with pre-built binaries for Windows, macOS and Linux.
-Open the [latest release page](https://github.com/Wilfred/difftastic/releases/latest), download the file matching your OS and CPU architecture, and extract the `difft` executable application file.
+Difftastic releases are published as [GitHub
+releases](https://github.com/Wilfred/difftastic/releases) with
+pre-built binaries for Windows, macOS and Linux. Open the [latest
+release page](https://github.com/Wilfred/difftastic/releases/latest),
+download the file matching your OS and CPU architecture, and extract
+the `difft` executable application file.
 
 ## Package Manager
 
@@ -36,7 +40,9 @@ with `nix-env`.
 $ nix-env --install difftastic
 ```
 
-If you're a **Fedora** user, you can install [difftastic](https://packages.fedoraproject.org/pkgs/rust-difftastic/difftastic/) with `dnf`.
+If you're a **Fedora** user, you can install
+[difftastic](https://packages.fedoraproject.org/pkgs/rust-difftastic/difftastic/)
+with `dnf`.
 
 ```
 $ sudo dnf install difftastic
@@ -52,7 +58,8 @@ $ sudo pkg install difftastic
 
 ### Windows
 
-If you're a Windows user using **Windows Package Manager** (*WinGet*), you can install difftastic with `winget`.
+If you're a Windows user using **Windows Package Manager** (*WinGet*),
+you can install difftastic with `winget`.
 
 ```
 $ winget install difftastic

manual/src/jj.md

@@ -11,5 +11,3 @@ file](https://jj-vcs.github.io/jj/latest/config/#user-config-files).
 [ui]
 diff-formatter = ["difft", "--color=always", "$left", "$right"]
 ```
-
-

manual/src/parser_vendoring.md

@@ -27,7 +27,7 @@ $ ln -s tree-sitter-json/src tree-sitter-json-src
 ```
 
 You can now add the parser to build by including the directory in
-`build.rs`. 
+`build.rs`.
 
 ```
 TreeSitterParser {