fixes typo

Author: Bryan Knight

pages/Compiler Options.md

@@ -56,7 +56,7 @@ Option                                         | Type      | Default
 `--skipLibCheck`                               | `boolean` | `false`                        | Don't check a the default library (`lib.d.ts`) file's valitidy.
 `--skipDefaultLibCheck`                        | `boolean` | `false`                        | Don't check a user-defined default library (`*.d.ts`) file's valitidy.
 `--sourceMap`                                  | `boolean` | `false`                        | Generates corresponding '.map' file.
-`--sourceRoot`                                 | `string`  | `null`                         | Specifies the location where debugger should locate TypeScript files instead of source locations. Use this flag if the sources will be located at run-time in a different location than that at design-time. The location specified will be embedded in the sourceMap to direct the debugger where the source files where be located.
+`--sourceRoot`                                 | `string`  | `null`                         | Specifies the location where debugger should locate TypeScript files instead of source locations. Use this flag if the sources will be located at run-time in a different location than that at design-time. The location specified will be embedded in the sourceMap to direct the debugger where the source files will be located.
 `--strictNullChecks`                           | `boolean` | `false`                        | In strict null checking mode, the `null` and `undefined` values are not in the domain of every type and are only assignable to themselves and `any` (the one exception being that `undefined` is also assignable to `void`).
 `--stripInternal`<sup>[1]</sup>                | `boolean` | `false`                        | Do not emit declarations for code that has an `/** @internal */` JSDoc annotation.
 `--suppressExcessPropertyErrors`               | `boolean` | `false`                        | Suppress excess property checks for object literals.