[NoMissnamedDocTagRule] Skip @return/@param inside constant prose docblock

[TomasVotruba]

NoMissnamedDocTagRule flagged constants whose docblock merely mentions @return/@param inside prose — not as a real tag. Method/property checks already require the tag to sit at the start of a docblock line (* @tag); the constant check did not. Aligned the constant regex to the same #\*\s(@param|@return)\b# shape.

Before — false positive

/**
 * Using 10-level array @return docblocks makes code very hard to read,
 * lets limit it to reasonable level
 */
private const int MAX_NESTING = 3;
// ❌ Constant doc comment tag must be @var, "@return" given

After — skipped

Same code, no error. A real misnamed tag is still reported:

/**
 * @return string
 */
private const NAME = 'value';
// ❌ Constant doc comment tag must be @var, "@return" given