gnu: Fix spelling of "This package" in various package descriptions.

* gnu/packages/cran.scm (r-formula-tools): Fix spelling of "This package" in
description.
* gnu/packages/emacs-xyz.scm (emacs-ibuffer-projectile): Likewise.
* gnu/packages/golang-xyz.scm (go-github-com-whyrusleeping-go-sysinfo): Likewise.
* gnu/packages/tex.scm (texlive-breakcites, texlive-psgo, texlive-footnpag,
texlive-pdfpc, texlive-phfcc): Likewise.

gnu/packages/cran.scm

@@ -31533,7 +31533,7 @@ pages.")
      "These utilities facilitate the programmatic manipulations of formulas,
 expressions, calls, assignments and other R language objects.  These objects
 all share the same structure: a left-hand side, operator and right-hand side.
-This packages provides methods for accessing and modifying this structures as
+This package provides methods for accessing and modifying this structures as
 well as extracting and replacing names and symbols from these objects.")
     (license license:gpl2)))
 

gnu/packages/emacs-xyz.scm

@@ -24977,7 +24977,7 @@ tabs, history, or bookmarks from Emacs.")
     (home-page "https://github.com/purcell/ibuffer-projectile")
     (synopsis "Group Ibuffer's list by Projectile root")
     (description
-     "This packages adds functionality to Emacs Ibuffer for grouping buffers
+     "This package adds functionality to Emacs Ibuffer for grouping buffers
 by their Projectile root directory.")
     (license license:gpl3+)))
 

gnu/packages/golang-xyz.scm

@@ -1945,7 +1945,7 @@ weighted moving averages}.")
     ;; There is not much information provided by the project, see
     ;; <https://github.com/whyrusleeping/go-sysinfo/issues>.
     (description
-     "This packages provides a basic system stats like @code{DiskUsage} and
+     "This package provides a basic system stats like @code{DiskUsage} and
 @code{MemoryInfo}.")
     (license license:expat)))
 

gnu/packages/tex.scm

@@ -7421,7 +7421,7 @@ of Arts and Sciences.")
     (home-page "https://ctan.org/pkg/breakcites")
     (synopsis "Ensure that multiple citations may break at line end")
     (description
-     "This packages makes a very minor change to the operation of the
+     "This package makes a very minor change to the operation of the
 @code{\\cite} command so that multiple citations may break at line end.  Note
 that the change is not necessary in unmodified LaTeX; however, there remain
 packages that restore the undesirable behaviour of the command as provided in
@@ -25931,7 +25931,7 @@ algorithms in a natural manner.")
     (home-page "https://ctan.org/pkg/psgo")
     (synopsis "Typeset go diagrams with PSTricks")
     (description
-     "This packages can be used to typeset go diagrams with PSTricks.")
+     "This package can be used to typeset go diagrams with PSTricks.")
     (license license:lppl)))
 
 (define-public texlive-psizzl
@@ -84378,7 +84378,7 @@ then the references are hyperlinked.  (References to footnotes in
     (home-page "https://ctan.org/pkg/footnpag")
     (synopsis "Per-page numbering of footnotes")
     (description
-     "This packages allows footnotes on individual pages to be numbered from @samp{1},
+     "This package allows footnotes on individual pages to be numbered from @samp{1},
 rather than being numbered sequentially through the document.")
     (license license:gpl3+)))
 
@@ -93364,7 +93364,7 @@ page.")
     (home-page "https://ctan.org/pkg/pdfpc")
     (synopsis "Define data for the @command{pdfpc} presentation viewer")
     (description
-     "This packages allows to define additional meta data within the PDF file which
+     "This package allows to define additional meta data within the PDF file which
 can be interpreted by the PDF presenter console (@command{pdfpc}) program.")
     (license license:gpl3+)))
 
@@ -93657,7 +93657,7 @@ context, though there is some overhead to this approach.")
     (home-page "https://ctan.org/pkg/phfcc")
     (synopsis "Convenient inline commenting in collaborative documents")
     (description
-     "This packages allows one to easily define helper macros to insert comments in
+     "This package allows one to easily define helper macros to insert comments in
 a LaTeX document.  A convenient syntax enables you to mark text
 additions (e.g., @samp{\\phf@{I'm adding this text@}}), an in-line
 comment (e.g., @samp{We're the best \\phf[I'm not sure about this.]}), and