[std] Fix the remainder of 'may' and 'shall' in footnotes.

Author: jensmaurer

source/lex.tex

@@ -641,7 +641,7 @@
 forming valid external identifiers. For example, some otherwise unused
 character or sequence of characters can be used to encode the
 \tcode{\textbackslash u} in a \grammarterm{universal-character-name}. Extended
-characters may produce a long external identifier, but \Cpp{} does not
+characters can produce a long external identifier, but \Cpp{} does not
 place a translation limit on significant characters for external
 identifiers. In \Cpp{}, upper- and lower-case letters are considered
 different for all identifiers, including external identifiers. }

source/preprocessor.tex

@@ -548,13 +548,13 @@
 \tcode{\#endif}
 \indextext{\idxcode{\#endif}}%
 are skipped.\footnote{As indicated by the syntax,
-a preprocessing token shall not follow a
+a preprocessing token cannot follow a
 \tcode{\#else}
 or
 \tcode{\#endif}
 directive before the terminating new-line character.
 However,
-comments may appear anywhere in a source file,
+comments can appear anywhere in a source file,
 including within a preprocessing directive.}
 
 \pnum

source/support.tex

@@ -2391,7 +2391,7 @@
 expressions.
 The array
 \tcode{new}
-expression, may, however, increase the \tcode{size} argument to
+expression, can, however, increase the \tcode{size} argument to
 \tcode{operator new[]}
 to obtain space to store supplemental information.}
 

source/templates.tex

@@ -9026,7 +9026,7 @@
 \grammarterm{template-parameter}
 of type
 \tcode{bool}
-may be deduced from an array bound, the resulting value will always be
+can be deduced from an array bound, the resulting value will always be
 \tcode{true}
 because the array bound will be nonzero.}
 \begin{example}