Docs: document E046, E047, E048

Author: strager

docs/errors/E046.md

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+# E046: unexpected characters in binary literal
+
+Binary number literals start with `0b` and can only contain `0` or `1` digits
+(and optionally an `n` to signify a `BigInt`). It is an error to include other
+digits in binary number literals:
+
+    let minInt64 = 0b1000000000000000000000000000000000000000000000000000000000000000N;
+    let mouse = [0xf09f, 0b196];
+
+To fix this error, fix or remove the extra digits or letters:
+
+    let minInt64 = 0b1000000000000000000000000000000000000000000000000000000000000000n;
+
+Alternatively, convert the binary number literal into a decimal, hexadecimal, or
+octal number literal:
+
+    let mouse = [0xf09f, 0xb196];

docs/errors/E047.md

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+# E047: unexpected characters in octal literal
+
+Octal number literals start with `0` or `0o` and can only contain digits `0`
+through `7` (and optionally an `n` to signify a `BigInt`). It is an error to
+include other digits in octal number literals:
+
+    let permissions = 0o755N;
+    let bcdDigits = 0o0123456789;
+    let million = 0o1e6;
+
+To fix this error, fix or remove the extra digits or letters:
+
+    let permissions = 0o755n;
+
+Alternatively, convert the octal number literal into a decimal or hexadecimal
+number literal:
+
+    let bcdDigits = 123456789;
+    let million = 1e6;

docs/errors/E048.md

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+# E048: unexpected characters in hex literal
+
+Hexadecimal (hex) number literals start with `0x` and can only contain digits
+`0` through `9` and `a` through `f` (and optionally an `n` to signify a
+`BigInt`). It is an error to include other letters in hex number literals:
+
+    let hungry = 0xfeedme;
+
+To fix this error, fix or remove the extra digits or letters:
+
+    let hungry = 0xfeedad00d;