Add keys formatting for ctrl and pipe to stand out more clearly as keyboard commands

Author: egrace479

docs/wiki-guide/Command-Line-Cheat-Sheet.md

@@ -12,9 +12,9 @@ See also [GitHub's Markdown Guide](https://docs.github.com/en/get-started/writin
 | `ls` | 		list everything in current directory (use `-a` to also show **a**ll files including hidden, `-l` for a **l**ong list including permissions and ownership info, `-1` ("dash one") to display the output with **1** item on each line) |
 | `wc -l <file>` |      use the **w**ord **c**ount command with the `-l` **l**ines option to list the number of lines in a file |
 | `du <dirname>/`|      calculate and show how much **d**isk **u**sage is consumed by a directory (use `-h` to make it **h**uman-readable, i.e. report in MB, GB or whatever units are most appropriate, and `-s` for **s**ummary of all the contents together rather than each item individually) |        
-| `ctrl r` |		search for command (will pop up `bck-i-search:`) |
+| ++ctrl+r++ |		search for command (will pop up `bck-i-search:`) |
 | `rm <target>` |       remove a file (or folder with `-r`). Beware when using `rm -rf <folder>` to **f**orce the **r**ecursive removal of all contents in a folder, which cannot be undone unless there is a backup. |
-| `<cmd1> \| <cmd2>` |   The "pipe" operator (`\|`) feeds the output of the first command (`cmd1`) to the input of the second command (`cmd2`). For example, show the total number of files in a directory with `ls -1 <dir> \| wc -l`|
+| `<cmd1> | <cmd2>` |   The "pipe" operator (++pipe++) feeds the output of the first command (`cmd1`) to the input of the second command (`cmd2`). For example, show the total number of files in a directory with `ls -1 <dir> | wc -l`|
 
 ### Git-Specific
 | Command | Action |

mkdocs.yaml

@@ -78,6 +78,7 @@ markdown_extensions:
   - pymdownx.superfences
   - pymdownx.tasklist
   - pymdownx.tilde
+  - pymdownx.keys
   - pymdownx.highlight:
       anchor_linenums: true
       line_spans: __span