docs: update README.md to follow float16 conventions

Author: opbot-xd

lib/node_modules/@stdlib/constants/float16/sqrt-pi/README.md

@@ -20,7 +20,7 @@ limitations under the License.
 
 # FLOAT16_SQRT_PI
 
-> Square root of the mathematical constant [π][@stdlib/constants/float16/pi].
+> Square root of the mathematical constant [π][pi].
 
 <section class="intro">
 
@@ -38,7 +38,7 @@ var FLOAT16_SQRT_PI = require( '@stdlib/constants/float16/sqrt-pi' );
 
 #### FLOAT16_SQRT_PI
 
-Square root of the mathematical constant [π][@stdlib/constants/float16/pi].
+Square root of the mathematical constant [π][pi].
 
 ```javascript
 var bool = ( FLOAT16_SQRT_PI === 1.7724609375 );
@@ -88,7 +88,7 @@ console.log( FLOAT16_SQRT_PI );
 
 <section class="links">
 
-[@stdlib/constants/float16/pi]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/constants/float16/pi
+[pi]: https://en.wikipedia.org/wiki/Pi
 
 </section>