Remove ranges and indices

[BillWagner]

Fast follow to merging dotnet/csharpstandard#1369

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📄 File	🔗 Preview link
docs/csharp/advanced-topics/reflection-and-attributes/index.md	Attributes
docs/csharp/asynchronous-programming/async-return-types.md	Async return types
docs/csharp/language-reference/builtin-types/enum.md	Enumeration types (C# reference)
docs/csharp/language-reference/builtin-types/unmanaged-types.md	"Unmanaged types"
docs/csharp/language-reference/keywords/const.md	The const keyword
docs/csharp/language-reference/operators/addition-operator.md	Addition operators - + and +=
docs/csharp/language-reference/operators/arithmetic-operators.md	Arithmetic operators (C# reference)
docs/csharp/language-reference/operators/assignment-operator.md	docs/csharp/language-reference/operators/assignment-operator
docs/csharp/language-reference/operators/await.md	await operator - asynchronously await for a task to complete
docs/csharp/language-reference/operators/bitwise-and-shift-operators.md	Bitwise and shift operators (C# reference)
docs/csharp/language-reference/operators/boolean-logical-operators.md	"Boolean logical operators - the boolean and, or, not, and xor operators"
docs/csharp/language-reference/operators/comparison-operators.md	Comparison operators (C# reference)
docs/csharp/language-reference/operators/conditional-operator.md	docs/csharp/language-reference/operators/conditional-operator
docs/csharp/language-reference/operators/delegate-operator.md	delegate operator
docs/csharp/language-reference/operators/equality-operators.md	Equality operators - test if two objects are equal or not
docs/csharp/language-reference/operators/is.md	"The is operator - Match an expression against a type or constant pattern"
docs/csharp/language-reference/operators/lambda-expressions.md	Lambda expressions and anonymous functions
docs/csharp/language-reference/operators/lambda-operator.md	docs/csharp/language-reference/operators/lambda-operator
docs/csharp/language-reference/operators/member-access-operators.md	Member access operators and expressions - the dot, indexer, and invocation operators.
docs/csharp/language-reference/operators/null-coalescing-operator.md	"?? and ??= operators - null-coalescing operators"
docs/csharp/language-reference/operators/operator-overloading.md	Operator overloading - predefined unary, arithmetic, equality, and comparison operators
docs/csharp/language-reference/operators/pointer-related-operators.md	Pointer related operators - take the address of variables, dereference storage locations, and access memory locations
docs/csharp/language-reference/operators/sizeof.md	docs/csharp/language-reference/operators/sizeof
docs/csharp/language-reference/operators/stackalloc.md	stackalloc expression (C# reference)
docs/csharp/language-reference/operators/subtraction-operator.md	- and -= operators - subtraction (minus)
docs/csharp/language-reference/operators/true-false-operators.md	"true and false operators - treat objects as Boolean values"
docs/csharp/language-reference/operators/type-testing-and-cast.md	Type-testing operators and cast expressions - is, as, typeof, and casts
docs/csharp/language-reference/statements/exception-handling-statements.md	docs/csharp/language-reference/statements/exception-handling-statements
docs/csharp/language-reference/statements/fixed.md	fixed statement - pin a variable for pointer operations
docs/csharp/linq/index.md	Language Integrated Query (LINQ)

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