Brought warning to high priority

Update functions.rst

Update for warning over note priority

Updated units-and-global-variables.rst

Updated file for warning over note priority

Updated control-structures.rst

Updated priority of warning over note

Updated assembly.rst

Updated priority of warning over code

Updated introduction-to-smart-contracts.rst

Updated priority of warning over note

Update installing-solidity.rst

Corrected control-structures.rst

Corrected white space error

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Corrected whitespace introduction to smart contract

docs/assembly.rst

@@ -394,6 +394,16 @@ use ``x_slot``, and to retrieve the byte-offset you use ``x_offset``.
 
 Local Solidity variables are available for assignments, for example:
 
+.. warning::
+    If you access variables of a type that spans less than 256 bits
+    (for example ``uint64``, ``address``, ``bytes16`` or ``byte``),
+    you cannot make any assumptions about bits not part of the
+    encoding of the type. Especially, do not assume them to be zero.
+    To be safe, always clear the data properly before you use it
+    in a context where this is important:
+    ``uint32 x = f(); assembly { x := and(x, 0xffffffff) /* now use x */ }``
+    To clean signed types, you can use the ``signextend`` opcode.
+
 .. code::
 
     pragma solidity >=0.4.11 <0.7.0;
@@ -407,16 +417,6 @@ Local Solidity variables are available for assignments, for example:
         }
     }
 
-.. warning::
-    If you access variables of a type that spans less than 256 bits
-    (for example ``uint64``, ``address``, ``bytes16`` or ``byte``),
-    you cannot make any assumptions about bits not part of the
-    encoding of the type. Especially, do not assume them to be zero.
-    To be safe, always clear the data properly before you use it
-    in a context where this is important:
-    ``uint32 x = f(); assembly { x := and(x, 0xffffffff) /* now use x */ }``
-    To clean signed types, you can use the ``signextend`` opcode.
-
 Labels
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