aspell, ispell: move from linux to common (#13437)

pages/common/aspell.md

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+# aspell
+
+> Interactive spell checker.
+> More information: <http://aspell.net/>.
+
+- Spell check a single file:
+
+`aspell check {{path/to/file}}`
+
+- List misspelled words from `stdin`:
+
+`cat {{path/to/file}} | aspell list`
+
+- Show available dictionary languages:
+
+`aspell dicts`
+
+- Run `aspell` with a different language (takes two-letter ISO 639 language code):
+
+`aspell --lang={{cs}}`
+
+- List misspelled words from `stdin` and ignore words from personal word list:
+
+`cat {{path/to/file}} | aspell --personal={{personal-word-list.pws}} list`

pages/common/ispell.md

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+# ispell
+
+> Interactive spell checking.
+> More information: <https://www.cs.hmc.edu/~geoff/ispell-man.html>.
+
+- Start an interactive session:
+
+`ispell`
+
+- Check for typos in the specified file and interactively apply suggestions:
+
+`ispell {{path/to/file}}`
+
+- Display version:
+
+`ispell -v`