shellcheck warnings for Arx in branch 1.1.2-r2

• SC1003 [docs] (1)
• SC1090 [docs] (1)
• SC2016 [docs] (1)
• SC2032 [docs] (1)
• SC2033 [docs] (1)
• SC2039 [docs] (1)
• SC2162 [docs] (1)
• SC2002 [docs] (2)
• SC2006 [docs] (2)
• SC2059 [docs] (2)
• SC2120 [docs] (2)
• SC2119 [docs] (3)
• SC2164 [docs] (5)
• SC2004 [docs] (10)
• SC2154 [docs] (13)
• SC2034 [docs] (22)
• SC2236 [docs] (23)
• SC2086 [docs] (24)