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De la docs au format Mkdocs

docs/Linux/variables.md

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+
+Incrémenter une variable:
+
+```bash
+i=$((i+1))              user    0m0.992s
+i=$((i++))              user    0m0.964s
+((i=i+1))               user    0m0.760s
+((i+=1))                user    0m0.700s
+((i++))                 user    0m0.644s
+((++i))                 user    0m0.556s
+let "i=i+1"             user    0m1.116s
+let "i+=1"              user    0m1.100s
+let "i++"               user    0m1.008s
+let i=i+1               user    0m0.952s
+let i+=1                user    0m1.040s
+let i++                 user    0m0.820s
+declare -i i; i=i+1     user    0m0.528s
+declare -i i; i+=1      user    0m0.492s
+i=0; i=$(expr $i + 1)   user    0m5.464s
+```
+