docs: fix example code in TS declaration files

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---

Author: Planeshifter

lib/node_modules/@stdlib/ndarray/empty/docs/types/index.d.ts

@@ -255,7 +255,7 @@ interface OptionsWithDType extends Options {
 *
 * @example
 * var arr = empty( [ 2, 2 ], {
-*     'dtype': float64'
+*     'dtype': 'float64'
 * });
 * // returns <ndarray>
 *
@@ -280,7 +280,7 @@ declare function empty( shape: Shape | number, options: Float64Options ): float6
 *
 * @example
 * var arr = empty( [ 2, 2 ], {
-*     'dtype': float32'
+*     'dtype': 'float32'
 * });
 * // returns <ndarray>
 *

lib/node_modules/@stdlib/ndarray/zeros/docs/types/index.d.ts

@@ -261,7 +261,7 @@ interface OptionsWithDType extends Options {
 *
 * @example
 * var arr = zeros( [ 2, 2 ], {
-*     'dtype': float64'
+*     'dtype': 'float64'
 * });
 * // returns <ndarray>
 *
@@ -287,7 +287,7 @@ declare function zeros( shape: Shape | number, options: Float64Options ): float6
 *
 * @example
 * var arr = zeros( [ 2, 2 ], {
-*     'dtype': float32'
+*     'dtype': 'float32'
 * });
 * // returns <ndarray>
 *

lib/node_modules/@stdlib/string/headercase/docs/types/index.d.ts

@@ -25,7 +25,7 @@
 * @returns HTTP header-cased string
 *
 * @example
-*  var str = headercase( 'Hello World!' );
+* var str = headercase( 'Hello World!' );
 * // returns 'Hello-World'
 *
 * @example