docs: update stats/base/dists/planck examples to use Greek symbols

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---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/planck/logpmf/README.md

@@ -216,7 +216,7 @@ int main( void ) {
         x = stdlib_base_round( random_uniform( 0.0, 11.0 ) );
         lambda = random_uniform( 0.1, 5.0 );
         y = stdlib_base_dists_planck_logpmf( x, lambda );
-        printf( "x: %.0f, lambda: %lf, ln(P(X = x; lambda)): %lf\n", x, lambda, y );
+        printf( "x: %.0f, λ: %lf, ln(P(X = x; λ)): %lf\n", x, lambda, y );
     }
 }
 ```

lib/node_modules/@stdlib/stats/base/dists/planck/mode/README.md

@@ -196,7 +196,7 @@ int main( void ) {
     for ( i = 0; i < 25; i++ ) {
         lambda = random_uniform( 0.1, 10.0 );
         y = stdlib_base_dists_planck_mode( lambda );
-        printf( "lambda: %lf, mode(X;λ): %lf\n", lambda, y );
+        printf( "λ: %lf, mode(X;λ): %lf\n", lambda, y );
     }
 }
 ```

lib/node_modules/@stdlib/stats/base/dists/planck/pmf/README.md

@@ -206,7 +206,7 @@ int main( void ) {
         x = stdlib_base_round( random_uniform( 0.0, 11.0 ) );
         lambda = random_uniform( 0.1, 5.0 );
         y = stdlib_base_dists_planck_pmf( x, lambda );
-        printf( "x: %.0f, lambda: %lf, P(X = x; lambda): %lf\n", x, lambda, y );
+        printf( "x: %.0f, λ: %lf, P(X = x; λ): %lf\n", x, lambda, y );
     }
 }
 ```

lib/node_modules/@stdlib/stats/base/dists/planck/stdev/examples/c/example.c

@@ -33,6 +33,6 @@ int main( void ) {
 	for ( i = 0; i < 25; i++ ) {
 		lambda = random_uniform( 0.1, 10.0 );
 		y = stdlib_base_dists_planck_stdev( lambda );
-		printf( "lambda: %lf, stdev: %lf\n", lambda, y );
+		printf( "λ: %lf, SD(X;λ): %lf\n", lambda, y );
 	}
 }