aspell: add page (#2193)

pages/linux/aspell.md

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