docs: add references and fix optional parameter documentation

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Author: kgryte

lib/node_modules/@stdlib/stats/array/stdevpn/README.md

@@ -162,6 +162,19 @@ console.log( v );
 
 <!-- /.examples -->
 
+* * *
+
+<section class="references">
+
+## References
+
+-   Neely, Peter M. 1966. "Comparison of Several Algorithms for Computation of Means, Standard Deviations and Correlation Coefficients." _Communications of the ACM_ 9 (7). Association for Computing Machinery: 496–99. doi:[10.1145/365719.365958][@neely:1966a].
+-   Schubert, Erich, and Michael Gertz. 2018. "Numerically Stable Parallel Computation of (Co-)Variance." In _Proceedings of the 30th International Conference on Scientific and Statistical Database Management_. New York, NY, USA: Association for Computing Machinery. doi:[10.1145/3221269.3223036][@schubert:2018a].
+
+</section>
+
+<!-- /.references -->
+
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
 <section class="related">
@@ -178,6 +191,10 @@ console.log( v );
 
 [@stdlib/array/base/accessor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/accessor
 
+[@neely:1966a]: https://doi.org/10.1145/365719.365958
+
+[@schubert:2018a]: https://doi.org/10.1145/3221269.3223036
+
 </section>
 
 <!-- /.links -->

lib/node_modules/@stdlib/stats/array/stdevpn/lib/main.js

@@ -42,7 +42,7 @@ var GENERIC_DTYPE = 'generic';
 * Computes the standard deviation of an array using a two-pass algorithm.
 *
 * @param {NumericArray} x - input array
-* @param {number} correction - degrees of freedom adjustment
+* @param {number} [correction=1.0] - degrees of freedom adjustment
 * @throws {TypeError} first argument must have a supported data type
 * @throws {TypeError} first argument must be an array-like object
 * @throws {TypeError} second argument must be an number

lib/node_modules/@stdlib/stats/array/stdevwd/README.md

@@ -162,6 +162,19 @@ console.log( v );
 
 <!-- /.examples -->
 
+* * *
+
+<section class="references">
+
+## References
+
+-   Welford, B. P. 1962. "Note on a Method for Calculating Corrected Sums of Squares and Products." _Technometrics_ 4 (3). Taylor & Francis: 419–20. doi:[10.1080/00401706.1962.10490022][@welford:1962a].
+-   van Reeken, A. J. 1968. "Letters to the Editor: Dealing with Neely's Algorithms." _Communications of the ACM_ 11 (3): 149–50. doi:[10.1145/362929.362961][@vanreeken:1968a].
+
+</section>
+
+<!-- /.references -->
+
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
 <section class="related">
@@ -178,6 +191,10 @@ console.log( v );
 
 [@stdlib/array/base/accessor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/accessor
 
+[@welford:1962a]: https://doi.org/10.1080/00401706.1962.10490022
+
+[@vanreeken:1968a]: https://doi.org/10.1145/362929.362961
+
 </section>
 
 <!-- /.links -->

lib/node_modules/@stdlib/stats/array/stdevyc/README.md

@@ -162,6 +162,18 @@ console.log( v );
 
 <!-- /.examples -->
 
+* * *
+
+<section class="references">
+
+## References
+
+-   Youngs, Edward A., and Elliot M. Cramer. 1971. "Some Results Relevant to Choice of Sum and Sum-of-Product Algorithms." _Technometrics_ 13 (3): 657–65. doi:[10.1080/00401706.1971.10488826][@youngs:1971a].
+
+</section>
+
+<!-- /.references -->
+
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
 <section class="related">
@@ -178,6 +190,8 @@ console.log( v );
 
 [@stdlib/array/base/accessor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/accessor
 
+[@youngs:1971a]: https://doi.org/10.1080/00401706.1971.10488826
+
 </section>
 
 <!-- /.links -->

lib/node_modules/@stdlib/stats/array/stdevyc/lib/main.js

@@ -42,7 +42,7 @@ var GENERIC_DTYPE = 'generic';
 * Computes the standard deviation of an array using a one-pass algorithm proposed by Youngs and Cramer.
 *
 * @param {NumericArray} x - input array
-* @param {number} correction - degrees of freedom adjustment
+* @param {number} [correction=1.0] - degrees of freedom adjustment
 * @throws {TypeError} first argument must have a supported data type
 * @throws {TypeError} first argument must be an array-like object
 * @throws {TypeError} second argument must be an number