docs: fix incorrect prefer-nullish-coercing documentation (#7408)

Fix misleading documentation

packages/eslint-plugin/docs/rules/prefer-nullish-coalescing.md

@@ -22,7 +22,7 @@ This rule will not work as expected if [`strictNullChecks`](https://www.typescri
 
 ### `ignoreTernaryTests`
 
-Setting this option to `true` (the default) will cause the rule to ignore any ternary expressions that could be simplified by using the nullish coalescing operator.
+Setting this option to `true` will cause the rule to ignore any ternary expressions that could be simplified by using the nullish coalescing operator. This is set to `false` by default.
 
 Incorrect code for `ignoreTernaryTests: false`, and correct code for `ignoreTernaryTests: true`:
 
@@ -62,7 +62,7 @@ foo ?? 'a string';
 
 ### `ignoreConditionalTests`
 
-Setting this option to `true` (the default) will cause the rule to ignore any cases that are located within a conditional test.
+Setting this option to `true` will cause the rule to ignore any cases that are located within a conditional test. This is set to `false` by default.
 
 Generally expressions within conditional tests intentionally use the falsy fallthrough behavior of the logical or operator, meaning that fixing the operator to the nullish coalesce operator could cause bugs.
 
@@ -104,7 +104,7 @@ a ?? b ? true : false;
 
 ### `ignoreMixedLogicalExpressions`
 
-Setting this option to `true` (the default) will cause the rule to ignore any logical or expressions that are part of a mixed logical expression (with `&&`).
+Setting this option to `true` will cause the rule to ignore any logical or expressions that are part of a mixed logical expression (with `&&`). This is set to `false` by default.
 
 Generally expressions within mixed logical expressions intentionally use the falsy fallthrough behavior of the logical or operator, meaning that fixing the operator to the nullish coalesce operator could cause bugs.