Use more common phrase for filename case-sensitive OS

It turns out that "filename case-sensitive operating system" is not a common phrase, so maybe not clear, and without an
exact definition to be found from a search.

Author: per1234

internal/rule/ruleconfiguration/ruleconfiguration.go

@@ -193,7 +193,7 @@ var configurations = []Type{
 		ID:               "LS009",
 		Brief:            "src folder case",
 		Description:      "",
-		MessageTemplate:  "Incorrect src folder name case: {{.}}. This will cause the library to not be recognized on case-sensitive operating systems. See: https://arduino.github.io/arduino-cli/latest/library-specification/#library-root-folder",
+		MessageTemplate:  "Incorrect src folder name case: {{.}}. This will cause the library to not be recognized on case-sensitive file systems. See: https://arduino.github.io/arduino-cli/latest/library-specification/#library-root-folder",
 		DisableModes:     nil,
 		EnableModes:      []rulemode.Type{rulemode.Default},
 		InfoModes:        nil,
@@ -288,7 +288,7 @@ var configurations = []Type{
 		Subcategory:      "general",
 		ID:               "LP003",
 		Brief:            "library.properties file name case",
-		Description:      `This causes "1.5" format (AKA "recursive layout") libraries to not be recognized on filename case-sensitive operating systems.`,
+		Description:      `This causes "1.5" format (AKA "recursive layout") libraries to not be recognized on case-sensitive file systems.`,
 		MessageTemplate:  "Incorrect library.properties file name case: {{.}}. See: https://arduino.github.io/arduino-cli/latest/library-specification/#library-metadata",
 		DisableModes:     nil,
 		EnableModes:      []rulemode.Type{rulemode.Default},
@@ -1136,7 +1136,7 @@ var configurations = []Type{
 		Subcategory:      "miscellaneous",
 		ID:               "LC001",
 		Brief:            "Arduino.h case",
-		Description:      "This causes compilation failure on filename case-sensitive OS (e.g., Linux).",
+		Description:      "This causes compilation failure on case-sensitive file systems.",
 		MessageTemplate:  "Incorrect Arduino.h filename case in #include directive: {{.}}",
 		DisableModes:     nil,
 		EnableModes:      []rulemode.Type{rulemode.Default},
@@ -1313,7 +1313,7 @@ var configurations = []Type{
 		ID:               "SS005",
 		Brief:            "src folder case",
 		Description:      "",
-		MessageTemplate:  "Incorrect src folder case: {{.}}. This will cause the source files under it to not be compiled on case-sensitive operating systems. See: https://arduino.github.io/arduino-cli/latest/sketch-specification/#src-subfolder",
+		MessageTemplate:  "Incorrect src folder case: {{.}}. This will cause the source files under it to not be compiled on case-sensitive file systems. See: https://arduino.github.io/arduino-cli/latest/sketch-specification/#src-subfolder",
 		DisableModes:     nil,
 		EnableModes:      []rulemode.Type{rulemode.Default},
 		InfoModes:        nil,
@@ -1328,7 +1328,7 @@ var configurations = []Type{
 		Subcategory:      "miscellaneous",
 		ID:               "SC001",
 		Brief:            "Arduino.h case",
-		Description:      "This causes compilation failure on filename case-sensitive OS (e.g., Linux).",
+		Description:      "This causes compilation failure on filename case-sensitive file systems.",
 		MessageTemplate:  "Incorrect Arduino.h filename case in #include directive: {{.}}",
 		DisableModes:     nil,
 		EnableModes:      []rulemode.Type{rulemode.Default},
@@ -1472,7 +1472,7 @@ var configurations = []Type{
 		Subcategory:      "miscellaneous",
 		ID:               "PC001",
 		Brief:            "Arduino.h case",
-		Description:      "This causes compilation failure on filename case-sensitive OS (e.g., Linux).",
+		Description:      "This causes compilation failure on filename case-sensitive file systems.",
 		MessageTemplate:  "Incorrect Arduino.h filename case in #include directive: {{.}}",
 		DisableModes:     nil,
 		EnableModes:      []rulemode.Type{rulemode.Default},