Name boolean arguments in StreamReader ctors (#119802)

Update `StreamReader` constructors to name boolean arguments for clarity.

Author: xtqqczze

src/libraries/System.Private.CoreLib/src/System/IO/StreamReader.cs

@@ -101,22 +101,22 @@ private StreamReader()
         }
 
         public StreamReader(Stream stream)
-            : this(stream, true)
+            : this(stream, detectEncodingFromByteOrderMarks: true)
         {
         }
 
         public StreamReader(Stream stream, bool detectEncodingFromByteOrderMarks)
-            : this(stream, Encoding.UTF8, detectEncodingFromByteOrderMarks, DefaultBufferSize, false)
+            : this(stream, Encoding.UTF8, detectEncodingFromByteOrderMarks, DefaultBufferSize, leaveOpen: false)
         {
         }
 
         public StreamReader(Stream stream, Encoding? encoding)
-            : this(stream, encoding, true, DefaultBufferSize, false)
+            : this(stream, encoding, detectEncodingFromByteOrderMarks: true, DefaultBufferSize, leaveOpen: false)
         {
         }
 
         public StreamReader(Stream stream, Encoding? encoding, bool detectEncodingFromByteOrderMarks)
-            : this(stream, encoding, detectEncodingFromByteOrderMarks, DefaultBufferSize, false)
+            : this(stream, encoding, detectEncodingFromByteOrderMarks, DefaultBufferSize, leaveOpen: false)
         {
         }
 
@@ -131,7 +131,7 @@ public StreamReader(Stream stream, Encoding? encoding, bool detectEncodingFromBy
         // of those three match, it will use the Encoding you provided.
         //
         public StreamReader(Stream stream, Encoding? encoding, bool detectEncodingFromByteOrderMarks, int bufferSize)
-            : this(stream, encoding, detectEncodingFromByteOrderMarks, bufferSize, false)
+            : this(stream, encoding, detectEncodingFromByteOrderMarks, bufferSize, leaveOpen: false)
         {
         }
 
@@ -177,7 +177,7 @@ public StreamReader(Stream stream, Encoding? encoding = null, bool detectEncodin
         }
 
         public StreamReader(string path)
-            : this(path, true)
+            : this(path, detectEncodingFromByteOrderMarks: true)
         {
         }
 
@@ -187,7 +187,7 @@ public StreamReader(string path, bool detectEncodingFromByteOrderMarks)
         }
 
         public StreamReader(string path, Encoding? encoding)
-            : this(path, encoding, true, DefaultBufferSize)
+            : this(path, encoding, detectEncodingFromByteOrderMarks: true, DefaultBufferSize)
         {
         }
 
@@ -202,7 +202,7 @@ public StreamReader(string path, Encoding? encoding, bool detectEncodingFromByte
         }
 
         public StreamReader(string path, FileStreamOptions options)
-            : this(path, Encoding.UTF8, true, options)
+            : this(path, Encoding.UTF8, detectEncodingFromByteOrderMarks: true, options)
         {
         }