Update cheatsheets

tldr/libreoffice

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# libreoffice
+
+> CLI for the powerful and free office suite LibreOffice.
+> More information: <https://www.libreoffice.org/>.
+
+- Open one or more files in read-only mode:
+
+`libreoffice --view {{path/to/file1 path/to/file2 ...}}`
+
+- Display the content of one or more files:
+
+`libreoffice --cat {{path/to/file1 path/to/file2 ...}}`
+
+- Print files using a specific printer:
+
+`libreoffice --pt {{printer_name}} {{path/to/file1 path/to/file2 ...}}`
+
+- Convert all `.doc` files in current directory to PDF:
+
+`libreoffice --convert-to {{pdf}} {{*.doc}}`