Warnings + documentation cleanups.

modules/juce_core/native/juce_posix_SharedCode.h

@@ -543,7 +543,7 @@ void MemoryMappedFile::openInternal (const File& file, AccessMode mode)
 MemoryMappedFile::~MemoryMappedFile()
 {
     if (address != nullptr)
-        munmap (address, range.getLength());
+        munmap (address, (size_t) range.getLength());
 
     if (fileHandle != 0)
         close (fileHandle);

modules/juce_core/network/juce_Socket.cpp

@@ -150,7 +150,7 @@ namespace SocketHelpers
         fd_set* const pwset = forReading ? nullptr : &wset;
 
        #if JUCE_WINDOWS
-        if (select (handle + 1, prset, pwset, 0, timeoutp) < 0)
+        if (select ((int) handle + 1, prset, pwset, 0, timeoutp) < 0)
             return -1;
        #else
         {

modules/juce_core/network/juce_URL.h

@@ -150,7 +150,7 @@ public:
     /** Returns an array of the names of all the URL's parameters.
 
         E.g. for the url "www.fish.com?type=haddock&amount=some+fish", this array would
-        contain two items: "type" and "haddock".
+        contain two items: "type" and "amount".
 
         You can call getParameterValues() to get the corresponding value of each
         parameter. Note that the list can contain multiple parameters with the same name.