docs(guide/expressions): replace curly quotes with straight quotes in code example

REAL QUOTES HAVE CURVES

Closes #10017
docs($route): fix description of the caseInsensitiveMatch property

Closes #10028
docs(guide/expressions): clarify regexp literals usage in expressions

Closes #10026

Closes #10030
refactor($parse): separate tokenizing vs parsing more
Fixes `a.b` and `a .b` generating different getterFns
Fixes `{'': ...}` turning into `{"''": ...}`
Fixes `{.: ...}` parsing as `{'.': ...}` instead of throwing
Fixes #9131
feat(ngPluralize): add support for bind-once in `count`

Closes #10004
refactor(ngPluralize): minor refactoring to avoid repetition

Move regular expression outside of the `link` function (so it doesn't get
created for every instance of `ngPluralize`.
Replace `RegExp.test + String.replace + String.replace` with `RegExp.exec
+ string concatenation`.